Apple ID support
How do I change my Apple ID without knowing my passcode?
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Passcode or password?
See the Apple Support article(s) below.
Passcode - If you forgot the passcode for your iPhone or your device is disabled.
Passcode - If you forgot the passcode for your iPad or your device is disabled.
Passcode - If you forgot the passcode for your iPod Touch or your device is disabled.
For the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get an email option if necessary.