In order to create a "Pop-up" push notification, you can:
1. Click on "Settings" in the side-navigation bar.
2. Select "Notifications"
3. Once done, click on the "App Notifications" option as shown.
4. Click on the "Add Notification" button.
5. Here, select the "Pop-up" option from the drop-down.
6. Enter the "Title"
7. Check this box if you want to select "All Courses"
8. Select the "Individual Course" from here.
9. Add the image over here.
10. Enter the "Scheduled Time" here.
11. Save.