I want to change my iCloud account
How to change my iCloud account to a different one because I have forgotten my password for emails and accounts
iPhone 8, iOS 16
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The email account that is not an Apple ID address , yet configured in the iPhone Add an email account to your iPhone, iPad, or iPod touch - Apple Support , their passwords can be reset from a web browser with essential account credentials for gmail accounts see the link https://support.google.com/mail/answer/41078?hl=en&co=GENIE.Platform%3DiOS&oco=1
Once you reset them you must know your Apple ID password , to switch with different account see the article Change your Apple ID - Apple Support