You have to manage your iTunes account in iTunes. Follow these instructions to change account information.
You can change your Apple ID name, password, or billing information at any time.
Choose Store > View My Apple ID, and sign in.
Click Edit.
Make your changes, and click Done.
Your changes take effect immediately.
If you also use your Apple ID in other apps, you don't need to update your information in those apps. The changes you make in iTunes apply to all apps in which you use your Apple ID.
If you have an AOL account, changes you make in iTunes don't affect your AOL account on the AOL service. For example, if you change your password in iTunes, the password you use to log in to the AOL service doesn't change.
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