Inputting your times during setup.
As the App is used all over the World and not everyone understands military time, we have to use 12hr time.
As the day has to run naturally, you cannot for example set an earlier lunch time than your wake up time. Therefore when you try to change the AM / PM wheel, it will change back if there is a conflict.
When you select your wake up time then move onto your lunch time and then do the same for your evening time.
If you get stuck, try starting with your Wake up time and working your way down to lunch and then evening.