From time to time you may need to cancel an individual Appointment, for example, due to an absent trainer. You can decide to simply lock the slot (see here) or make the cancellation from the calendar view of your Dashboard.
To make your once off Appointment cancellation, follow the steps outlined below:
1. Navigate to your calendar.
2. Ensure the filters on the left are set to show all slots
3. Click on the Appointment in your calendar.
4. At the bottom of the appointment window, click delete.