Only users with a administrator or booking administrator role can edit a booking.
These users can edit their own bookings and the bookings of other users.
The first way to edit a booking is via the booking confirmation page, where you can click the 'Edit booking' tab, as shown in the image below:
The second way to edit a booking is to click on a booking on the booking sheet, which will bring up the below overlay and then clicking the 'Edit booking' tab.
After clicking the 'Edit booking' tab on either on these methods, you will be taken to the edit booking page, as shown in the image below:
Here you can make changes to the booking. Once you have finished making your changes, click the 'Submit' tab. You will now be taken to the booking confirmation page with the new details in place: