Sign out of your Apple ID
Sign out of every Apple service and device that uses your Apple ID.
If you want to use your iPhone, iPad, or iPod touch to change your Apple ID, stay signed in to your Apple ID on just that device.
Change your email address
You can change your Apple ID from your account page or from your iOS device with 10.3 or later.
From your Apple ID account page: Go to appleid.apple.com and sign in. In the Account section, click Edit. Under your Apple ID, click Change Apple ID.
On your iPhone, iPad, or iPod touch: Go to Settings > [your name] > Name, Phone Numbers, Email. Next to Reachable At, tap Edit > Delete. Tap Continue and follow the instructions you see.
When you change your email address, you might be asked to answer one or more of your security questions.
Verify your new email
After you enter the email address that you want to use as your Apple ID, a verification code is sent to you at that address. Enter the verification code from the email into the fields provided and start using your updated Apple ID. Didn't get the email?
Sign back in
After you change your Apple ID, you need to use your new sign-in information with all Apple services that you use.
If you can't change your Apple ID
You can change your Apple ID to any other email address you control, as long as it's not already in use as an Apple ID. If your email address ends with @icloud.com, @me.com, or @mac.com, you can't change your Apple ID. You also won't see Change Apple ID on your account page or the option to delete your email on your iPhone, iPad, or iPod touch with iOS 10.3 or later.
If you want to sign in with a different Apple ID
If you want to change the Apple ID that you use on your iPhone, iPad, or iPod touch—and not change the email address that you use as your Apple ID—follow these steps to sign out, then back in with a different Apple ID.
If you enter your email address incorrectly when you create your Apple ID
If you create your Apple ID with an email address that you can't verify, sign in to your Apple ID account page with the email address that you entered when you set up your Apple ID. Then you can change your Apple ID to the correct email address.