Hello from Fredericksburg Texas. I think you can cancel the delay from the Home screen. Click on the "rain delay" icon and you should be able to cancel the delay from there. 

Hab einen schönen Abend, 

Dear customer,

To cancel a rain delay, you can select the date with grey dot and there will pop up the restriction,  please select the restriction and it will show option to cancel. Rain delay is to forbidden watering in the next following days after rain and it is one-time setting. If you want to save the settings, please go to settings->preferences -> rain -> days to skip.

Thanks,

Wency

Netro Support