How to I change my email address
How do I change my email address with Apple
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See Change your Apple ID https://support.apple.com/en-us/HT202667.
And see What to do after you change your Apple ID or
Password https://support.apple.com/en-us/HT204071 (supplementary to what the fist link says)
And FYI, see iCloud: About your @icloud.com, @me.com, and @mac.com email addresses https://support.apple.com/en-us/HT201771
Post back if you have questions about what you can do if your Apple ID (1) is a third-party apple ID or (2) ends in icloud.com, me.com, or mac.com.