If you wan to reset all settings for your controller and delete all watering histoires, you can do a factory reset and please follow the below steps:
1.Power off the device(unplug the power adapter)
2.Wait for 2 seconds, replug the power back in
3.Wait for 3 minutes for the device to start up
4.Press and hold the reset button for 8 seconds to do a hard reset
5.Wait for 3 minutes. This should set the light to slow blinking.
6. Then you can go to the Netro app -> settings-> controller -> change wifi network/password