To reschedule an appointment, click on the "Reschedule Appointment" button in your appointment confirmation email. Appointments must be rescheduled at least 12 hours in advance. Rescheduling an appointment is only permitted within seven days of the appointment - you may not reschedule more than seven days in advance.
When you reschedule an appointment, only that appointment changes. Any future appointments you have scheduled will remain the same. If you want to change your future appointments as well, change each appointment separately.