How do I change my email address on thus Apple

Do you want to change the email you use to log in to your Apple ID account? Here are instructions to do that→Apple ID: Changing your Apple ID

If you want to change to a different Apple ID account for purchases just log out, and log in with the new account. But if you do this all purchases with the previous account will require the previous account password when you want to update them.

Hello,

Would you like to change between different accounts you own, or change the e-mail that you use in this single Apple ID?