All your zones are listed on the home screen of the Netro app. Press the play button to water the zones. To adjust the time, click on the numbers displaying the duration to the left of the play button.

To run your sprinklers for only one day in the future, go to the Schedule on your Netro app. Click on the plus sign on the top of the screen next to the month name. This will have you create a one-time run. Adjust what zones you want to water, the duration, and the start time. Then select the day you want the system to water.