In order to create a "Greeting" 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 "Greetings" option from the drop-down.
6. Select the receiver of the notification here.
7. Enter the "Title" of the notification here.
8. Add the "Body" of the notification here.
9. Add the image here.
10. Select the scheduled date & time from here.
11. "Save" once done.