From the Push Buttons tab, tap the '+' blue button at the top. The 'Add a Push Button' displays.
Press and hold for 3 seconds the button at the center of your Push Button accessory. Release the button when the light flashes. Then wait a few seconds for the app to detect your Push Button accessory.
When the push button is detected, a text box displays where you can enter a name for your button. It's optional but we highly recommend to name your button. Press save to return to the Push Buttons tab. Your push button should now be listed.