Q: I changed my email address and one nothing. Works on my account

You need to be more specific about your problem.

Apple ID: Changing your Apple ID

http://support.apple.com/kb/ht5621http://support.apple.com/kb/ht5621

Using your Apple ID for Apple services

http://support.apple.com/kb/HT4895http://support.apple.com/kb/HT4895

Apple ID: What to do after you change your Apple ID

http://support.apple.com/kb/HT5796?viewlocale=en_US&locale=en_UShttp://support.apple.com/kb/HT5796?viewlocale=en_US&locale=en_US

iTunes Store: Associating a device or computer to your Apple ID

http://support.apple.com/kb/ht4627http://support.apple.com/kb/ht4627

iOS: Changing the signed-in iTunes Store Apple ID Account

http://support.apple.com/kb/ht1311http://support.apple.com/kb/ht1311

 Cheers, Tom