Q: how do I cancel a preordered movie on my ipad

Hi ladyfair,

To cancel a preorder, access your account from a computer as described in this article:

iTunes Store: About Pre-orders

http://support.apple.com/kb/HT5714

Check out the section called "To view, cancel, or see the expected release dates for your pending pre-orders."

Have a good one!
- Ari