Do it via the app.On the screen with the dial to set the temperature,
there are icons at the bottom of the screen. One is Schedule. You can do
it in there.
Welcome one tip, don’t send the base plate back. The one with the blue
bubble spirit level.impossible to replace and I’ve been told to buy a
thermostat on 2nd-hand market to get one. And that was by Google
Support.Good luck