Do I have to re-register a new Facebook account to change my facebook.com/USERNAME?
Or are there any ways to change it?
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You can only change your Facebook username once. If you have already changed it then there is no way to change it again. You would have to setup a new account and claim a new username that way.
The option to change your username is in
Account Settings >
Username. If that option is not available then you cannot change your username.
How do I change my username?
You can change your username from the Settings tab of the Account Settings page. Scroll down to "Username" and click "change." Then follow the on-screen directions. Keep in mind you will only be able to change your username once.