Open the booking in Bookings and choose Move or Cancel. You see what it costs under the terms you agreed before anything changes. If it's too late to move, message the business.


Open the booking
Go to Bookings and open it.
Choose Move
You see the time it has now.
Pick a new time
Choose a day and a free time. It's the same price and terms.
Confirm
The business is told. It's the same booking, with its messages and what's due.
If Move is greyed out, the booking says why, for example Can't move within 48 hours. Some businesses move bookings themselves: then it says to message them. A class moves to another session of the same class that still has places.
Open the booking and choose Cancel
You see Cancel this booking? with its date and time.
Check what it costs
It says Cancelling now is free, or what it costs under the terms you agreed. Below that, Recorded so far is what the business has logged as paid, and Still to pay is what's left.
Choose Cancel booking
Or choose Keep it to leave it as it is.
The business is told straight away. If you still owe a fee, the screen shows how to pay it, with the business's bank details and a reference.
For a date in a regular booking, Cancel asks which dates: Only that date, so every other date stays booked, or that date and every date after, which ends the series. Choose Move instead if you'd rather keep it.
A request the business hasn't accepted yet shows Withdraw request instead of Cancel. Nothing is booked yet, so nothing is owed.