Have you tried changing it in settings?
https://www.chess.com/settings
How to change username when signed up via Facebook
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Dec 1, 2022
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#2
justbefair wrote:
Have you tried changing it in settings?
I tried that but it askes for password, and as a facebook login user, I don't have password. hope anybody could help me
same problem.. 
Hi, how do I change my username when I used Facebook to signup? It has my full name