diff --git a/backend/src/controller/classroom/mod.rs b/backend/src/controller/classroom/mod.rs
index 0aa37ce..6ba46dc 100644
--- a/backend/src/controller/classroom/mod.rs
+++ b/backend/src/controller/classroom/mod.rs
@@ -27,6 +27,8 @@ pub async fn get_courses(user_id: i32) -> (Status, Json<JsonResult<Vec<Classroom
     }
 }
 
+#[options("/classroom/course/<_u>")]
+pub fn register_course_contr_options(_u: i32) -> Status {Status::Ok}
 
 #[post("/classroom/course/<user_id>", format = "json", data = "<data>")]
 pub async fn register_course_contr(user_id: i32, data: Json<ClassroomCourseRegistration>) -> (Status, Json<JsonResult<()>>) {
diff --git a/backend/src/main.rs b/backend/src/main.rs
index 23c4f9d..cf1efd2 100644
--- a/backend/src/main.rs
+++ b/backend/src/main.rs
@@ -62,6 +62,7 @@ async fn rocket() -> _ {
             controller::classroom::create_user_options,
             controller::classroom::create_user,
             controller::classroom::get_courses,
+            controller::classroom::register_course_contr_options,
             controller::classroom::register_course_contr,
         ],
     )
diff --git a/frontend/src/OnlineClassroom/ClassroomRegistration.tsx b/frontend/src/OnlineClassroom/ClassroomRegistration.tsx
index e9e15fd..4438a04 100644
--- a/frontend/src/OnlineClassroom/ClassroomRegistration.tsx
+++ b/frontend/src/OnlineClassroom/ClassroomRegistration.tsx
@@ -4,7 +4,10 @@ import { ClassroomRegistrationPreview } from "./ClassroomRegistrationPreview";
 import { ClassroomSearchableSelect } from "./ClassroomSearchableSelect";
 import { ClassroomCourseValue } from "../types/ClassroomCourse";
 
-export function ClassroomRegistration() {
+export function ClassroomRegistration(props: {
+    surname_first_letter: string, userId: number | null,
+    onSuccess: () => void,
+}) {
     const [selections, setSelections] = createSignal<Array<ClassroomCourseValue>>([]);
 
     return (
@@ -20,8 +23,11 @@ export function ClassroomRegistration() {
             </FilledCard>
 
             <ClassroomRegistrationPreview
+                surname_first_letter={props.surname_first_letter}
+                userId={props.userId}
                 selections={selections()}
                 deleteRegister={(course_key) => setSelections((course) => course.filter((v) => v !== course_key))}
+                onSuccess={props.onSuccess}
             />
         </div>
     );
diff --git a/frontend/src/OnlineClassroom/ClassroomRegistrationPreview.tsx b/frontend/src/OnlineClassroom/ClassroomRegistrationPreview.tsx
index 9710f7f..302d30f 100644
--- a/frontend/src/OnlineClassroom/ClassroomRegistrationPreview.tsx
+++ b/frontend/src/OnlineClassroom/ClassroomRegistrationPreview.tsx
@@ -1,19 +1,52 @@
 import { For, createMemo } from "solid-js";
 import { FilledCard } from "../components/FilledCard";
 import { LoadingIcon } from "../icons/LoadingIcon";
-import { LoadingStatus, useLoading } from "../utils/functions";
+import { LoadingStatus, backend, useLoading, wait } from "../utils/functions";
 import { ClassroomCourseValue, allClassrooomCourses } from "../types/ClassroomCourse";
 import { XIcon } from "../icons/XIcon";
+import { JsonResult } from "../types/JsonResult";
+import { AxiosError } from "axios";
 
 export function ClassroomRegistrationPreview(props: {
+    surname_first_letter: string,
+    userId: number | null,
     selections: Array<ClassroomCourseValue>,
     deleteRegister: (k: string) => void,
+    onSuccess: () => void,
 }) {
-    const {status} = useLoading();
+    const {status, setStatus, setError} = useLoading();
 
     const loading = createMemo(() => status() === LoadingStatus.Loading);
 
     const submit = async() => {
+        if (props.userId === null) return;
+
+        setStatus(LoadingStatus.Loading);
+
+        if (import.meta.env.DEV) await wait(1500);
+
+        backend.post<JsonResult<null>>(`/api/classroom/course/${props.userId}`, {
+            surname_first_letter: "A",
+            courses: props.selections,
+        })
+            .then((response) => {
+                if (response.status === 200) {
+                    setStatus(LoadingStatus.Ok);
+                    props.onSuccess();
+                } else {
+                    console.error(response.data);
+                    setError(response.data.Err.reason);
+                    setStatus(LoadingStatus.Error);
+                }
+            })
+            .catch((err: AxiosError<JsonResult<null>>) => {
+                console.error(err);
+                if (err.response?.data?.Err?.reason) {
+                    setError(err.response.data.Err.reason);
+                }
+
+                setStatus(LoadingStatus.Error);
+            });
     };
 
     return (
@@ -40,7 +73,7 @@ export function ClassroomRegistrationPreview(props: {
                     class="bg-c-primary text-c-on-primary px-4 py-2 rounded-full cursor-pointer mt-4
                             disabled:opacity-50 disabled:cursor-not-allowed relative"
                     type="button"
-                    disabled={props.selections.length === 0 || loading()}
+                    disabled={props.userId === null || props.selections.length === 0 || loading()}
                     onclick={submit}
                 >
                     <span
diff --git a/frontend/src/OnlineClassroom/ClassroomUserCourses.tsx b/frontend/src/OnlineClassroom/ClassroomUserCourses.tsx
index 1408e4b..a901e11 100644
--- a/frontend/src/OnlineClassroom/ClassroomUserCourses.tsx
+++ b/frontend/src/OnlineClassroom/ClassroomUserCourses.tsx
@@ -1,16 +1,17 @@
-import { For, Show, createSignal, onMount } from "solid-js";
+import { For, Show, createEffect, createSignal, onMount } from "solid-js";
 import { LoadingStatus, backend, useLoading, wait } from "../utils/functions";
 import { JsonResult } from "../types/JsonResult";
 import { ClassroomCourse } from "../types/ClassroomCourse";
 import { LoadingIcon } from "../icons/LoadingIcon";
 
-export function ClassroomUserCourses(props: {userid: number}) {
+export function ClassroomUserCourses(props: {userid: number, updateSignal: number}) {
     const [courses, setCourses] = createSignal<Array<ClassroomCourse>>([]);
     const {setError, status, setStatus} = useLoading();
 
     const loadCourses = async() => {
         setStatus(LoadingStatus.Loading);
         setError("");
+        setCourses([]);
 
         if (import.meta.env.DEV) await wait(1500);
 
@@ -29,6 +30,14 @@ export function ClassroomUserCourses(props: {userid: number}) {
 
     onMount(loadCourses);
 
+    createEffect(() => {
+        // Update courses when updateSignal changes
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        const _ = props.updateSignal;
+
+        loadCourses();
+    });
+
     return (
         <div class="w-full">
             <h2 class="text-2xl">
diff --git a/frontend/src/OnlineClassroom/index.tsx b/frontend/src/OnlineClassroom/index.tsx
index 70e2910..881b038 100644
--- a/frontend/src/OnlineClassroom/index.tsx
+++ b/frontend/src/OnlineClassroom/index.tsx
@@ -11,12 +11,18 @@ type TabType = "Vinculate" | "Create";
 
 export function OnlineClassroom() {
     const [person, setPerson] = createSignal<Person | null>(null);
+    // Used to update ClassroomUserCourses
+    const [updateSignal, setUpdateSIgnal] = createSignal(0);
 
     return (
         <div class="grid grid-cols-[16rem_25rem_1fr]">
             <Search setPerson={setPerson} />
 
-            <ClassroomRegistration />
+            <ClassroomRegistration
+                surname_first_letter={person()?.person_paternal_surname[0] ?? ""}
+                userId={person()?.person_classroom_id ?? null}
+                onSuccess={() => setUpdateSIgnal((s) => s + 1)}
+            />
 
             <Show when={person() !== null && person()!.person_classroom_id === null}>
                 <ClassroomUser
@@ -25,7 +31,10 @@ export function OnlineClassroom() {
                 />
             </Show>
             <Show when={person() !== null && person()!.person_classroom_id !== null}>
-                <ClassroomUserCourses userid={person()!.person_classroom_id!} />
+                <ClassroomUserCourses
+                    userid={person()!.person_classroom_id!}
+                    updateSignal={updateSignal()}
+                />
             </Show>
 
         </div>