Ok so I am going to the Apple store to talk to a Genius about my Ipod Touch. What I am wondering is how do I reschedule my appointment to a later time?
That's been a frustrating experience I've had as well. I scheduled one for a later time (a new one) then called the store and asked them to please cancel my previous appointment.
Go to the main reservation page and click "view/edit my reservation." You can change the time to whatever is available, which probably won't be too much if you're scheduling last minute.