Resetting Year to date rain

I would like to reset the year to date rain rate data to start off the year fresh, but can’t find where to locate the command. Thank you.

setup, enter barometer offsets , other offsets,and rainfall

then you can either use teh slider, or type in the amount in the manual input box (if you have use inches ticked, type in say 35.567 or if not, type is say 856.5 (as examples), then click yes
and lastly click on save settings