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How to Change Your Apple ID

[Originally posted by donv (The Ghost).]

1. Change your Apple ID (Be very aware of the restrictions here.) 
2. Before changing your Apple ID using a computer, sign out of all Apple  services that use your Apple ID. If you are going to use an iPhone, iPad, or iPod, then stay signed in with your Apple ID on only that device. This instruction is taken from the above document under the heading Before you change your Apple ID.
3. For sign out purposes, see Where can I use my Apple ID? “This list is provided for informational purposes only and is subject to change without notice. It's not intended to include every feature or service that uses Apple ID. Visit the Apple ID support page for more information.”
4. There may be some redundancy, but see What to do after you change your Apple ID or password.

(I have done minor editing to improve presentation.)

If you aren't trying to change the email address, log into your Apple ID, and in the first section, select Edit. You should be able to change it there.

Apple ID - Manage