Modified app-level urls.py to add necessary urls for the dashboard app pages.

widget_CtrlF/dashboard/urls.py

 from django.urls import path
 
-from .views import index
+from .views import (dashboard, WidgetUserDetailView, WidgetUserCreateView, WidgetUserUpdateView)
 
 urlpatterns = [
-    path('', index, name='index'),
+    path ('dashboard/', dashboard, name='dashboard'),
+    path ('widgetusers/<int:pk>/details', WidgetUserDetailView.as_view(), name='widgetuser-details'),
+    path ('widgetusers/add', WidgetUserCreateView.as_view(), name='widgetuser-create'),
+    path ('widgetusers/<int:pk>/edit', WidgetUserUpdateView.as_view(), name='widgetuser-update')
 ]
 
 app_name = "dashboard"
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