Modified urls.py to add necessary urls for Forum app pages.

widget_OhMyBash/forum/urls.py

 from django.urls import path
 
-from .views import index
+from .views import (forum, ForumPostDetailView,
+                    ForumPostCreateView, ForumPostUpdateView)
 
 urlpatterns = [
-    path('', index, name='index'),
+    path('forum/', forum, name='forum'),
+    path('forumposts/<int:pk>/details/',
+         ForumPostDetailView.as_view(),
+         name='forumpost-details'),
+    path('forumposts/add/',
+         ForumPostCreateView.as_view(),
+         name='forumpost-create'),
+    path('forumposts/<int:pk>/edit/',
+         ForumPostUpdateView.as_view(),
+         name='forumpost-update'),
 ]
 
 app_name = "forum"