You can reschedule a lesson up to 3 times.
1. Go to “My lessons” and choose a lesson
2. Next to the “Join lesson” button, click three dots > “Reschedule lesson”
3. Pick a new time slot > “Confirm reschedule”

In the spirit of friendliness and mutual respect, let your tutor know about the changes😉.
If there aren’t any suitable slots for rescheduling, ask the tutor to add a new one suitable for both of you and reschedule.