Can I lock the Schedule?

Of course you can! You have two locking options:

1) until a specific time (Time Lock)
2) until connecting a charger. (Charger Lock)

To set up, go into the schedule details screen, press the lock icon on the top right corner and select your preferred locking option (Time Lock / Charger Lock). Please note that once you lock your schedules, you will not be able to do any changes.