How do you chane your email address as it is an old one?
I don't know how to change my user ID from my old email address to my new one. Please help
You should be able to update the primary email address on your account by logging into it via the Store > View Account menu option on your computer's iTunes - you should then see an Edit button at the top of your account's screen to the right of your id. Or, if you have an iOS device, you can do it by tapping on your id in Settings > iTunes & App Store and viewing your account.
Or you can log into it via this page and update it : http://appleid.apple.com
If you do have iOS devices you might need to log out of your account after updating it by tapping on your id in Settings > iTunes & App Store and then log back for the account to be 'refreshed' on them