When first starting Intervals ABA 4.0, you will see the screen below showing you the new features in Intervals ABA 4.0.
If this is the first time you've used Intervals ABA 4.0 on your device, you will be prompted to accept notifications. If you do not accept notifications, you will not be notified when it's time to record an observation outside of the app.
After you've accepted (or rejected) notifications, the app will start with the main form. At this point, it is ready to use.