Cancel the question. This app is not intuitive, and often fails to distinguish whether it is taking an action as part of smart watering or offering the user to initiate an action. I thought that the blue, round button for rain delay was a notification to me that the device was under a rain delay, not that it was the button to create one. They use the same round icons for zones and programs, so it is confusing.
They should use squares for data input like zones, programs and schedules and round buttons for commands like return home, control by Bluetooth or add rain delay.