Q: I changed my apple ID recently.  On my PC all is fine but when I try to access Itunes stores or update on My apple Iphoneor Ipad It gives me the old email ID and will not accept my password

Hello Carmellen,

Thank you for the details of the issue you are experiencing with the iTunes Store after changing your Apple ID. 

Use these steps to change the Apple ID signed into the iTunes Store on your iPhone and iPad:

Sign in with a different Apple ID

1. Tap Settings > iTunes & App Stores.
2. Tap your Apple ID.
   If you see the option to Sign In, you can change your Apple ID now.
   
3. Tap Sign Out.
   
4. Enter your Apple ID and Password and tap Sign In.
   Or if you don't have another Apple ID, tap Create New Apple ID.
   

You can find the full article here:

iOS: Sign in with a different Apple ID in the iTunes Store, App Store, and iBooks Store

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

Thank you for using Apple Support Communities.

Best,

Sheila M.