@iH Maybe try messaging the moderator team and ask them if they can change it for you.
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How can I change my username at the community login? Thank you
There is no option to do that for the general community member base. Only moderators could change it for you. Since you have no post history other than this thread, I would just sign up to the community again.
Just so you and others are aware, use the same email as your PM account so community rewards will get transferred over properly.
well if you are unable to change your username in the system it should not list change your username in the sign in page It should only say change your password. If you can not do it dont offer it