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This question already has an answer here:

How can I change my Facebook Page's username/link more than one time?

marked as duplicate by Alex, ale, Vidar S. Ramdal, Rubén, phwd Jul 29 '15 at 0:26

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1

You cannot.

You can only change the username for your personal profile once.

If you have a really, really, good reason you might try to ask a question on their support forum, but I wouldn't get my hopes up.

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