Sign in to your Apple ID account page
Go to Sign-In and Security
Select Apple ID or Email & Phone Numbers
Choose Change Apple ID
Enter the new email address you want to use
Verify the new email address with the code sent by Apple
Update your sign-in details on all Apple devices and services
If needed, add the new email as a reachable address in your account settings
If you use an @icloud.com, @me.com, or @mac.com address, note that it usually cannot be changed to a different email address
If your Apple ID is an email from another provider, you can change it to a different email address if Apple allows it