You won't be able to edit the names of attendees in a booking. However, you can do the following-
Canceling an Attendee from Frontdesk:
1. Go to Dashboard.
2. Click on the Calendar >> Class >> Select the class you wish to cancel the attendee from
3. A pop-up will open up. Select the attendee and click on cancel.
Adding the new Attendee to the class:
1. Go to Frontdesk>> Bookings
2. Select Payer. Select the class, add the dates, select the attendee
3. Select the class and enter the details
4. Confirm the booking
5. Go to class calendar and the attendee will be updated