It is impossible to change the username

"To avoid confusion, you may not change your username while connected to Live Chess or registered for any Live Chess competition. Please try again after you are done playing."

I wasn't playing or registered. I tried the suggestions in different threads, nothing works. This is very annoying.

You have tried logging off of all devices, closing any extra windows/tabs, then logging in and immediately changing your username?

Yes.

i have the same problem

Used to be you could only change it yourself once, and after that you had to contact Support. Try that.

It looks like you may have been successful. If you changed it to something and decided you don't like that, then you'll either have to wait 90 days to do it again, or contact Support directly, using the option in the menu.

So one can change one's username after 90 days now, irrespective of how many times you've changed it before? (assuming that the name you want to change to is not already taken, of course)

how do i find the right menu to do this? i don't like my username anymore

Open the superb support bot and ask there about name change

alright, thanks bro

Try the superb support first, perhaps there will be nothing to thank for

Select All Settings (bottom left sidebar) > Profile > then at bottom here (username CHANGE):

Yes