After setting up an appointment, you can always access BVirtual from the link provided in your appointment confirmation email (under the section “Connecting To Your Proctor On The Day and Time of your EXAM” as step 2).
Under “Your Scheduled Appointments”, there is a blue “Reschedule” button. There, you can pick any date and time to take your final exam. You’ll receive a new confirmation email afterward.
If you happen to sign out and sign back in, your status in the BVirtual system will be listed as a “No Show” and you’ll be able to reschedule again 30 minutes after your scheduled appointment time.