My email address has changed and I need to change it on all my devices.

meta2910 Said:

“My email address has changed and I need to change it on all my devices.“

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Modify your Credentials:

Having been hacked certainly consider modifying your credentials, immediately. Preforming the following is best at this point.  So, Consider...

• Modifying: your login credentials (using both a New eMail and a New Password) for Apple and each and all sites
• Associating: a different method of payment to your account
• Enabling: Two-Factor Authentication for Apple ID and for all other accounts that have such an 

See Change your Apple ID - Apple Support

FYI, your email address is your Apple ID. So you need to follow the instructions in anonyme's link exactly. If you do not or create a new Apple ID, problems with not being able to use previously purchased items/downloads, etc. will be the result.

Also note: if your Apple ID is/was a .mail/cloud/etc address, you cannot change it.

See if using this document/link will get the job done. What to do after you change your Apple ID or Password https://support.apple.com/en-us/HT204071