How to cancel or reschedule an Apple Genius Bar Reservation

I don't think you can currently cancel or reschedule a Genius Bar Reservation from Apple's GB reservation site.

If you have iOS though, you can cancel or reschedule using Apple's Apple Store.app. It's not obvious how ...

1. Tap Stores
2. Find store where you have reservation.
3. Click Store then Genius Bar. From here you can create a new appointment, or cancel or reschedule an existing appointment.

I don't think there's an Apple Store.app equivalent for the desktop, so, like iMessenger, this is strictly an iOS service.