Really? When I open preferences, I see I can’t change my username
in this page you should see a 
next to your username. Let me know if you don’t see it: https://forum.qubes-os.org/u/ppc/preferences/account
It might be an admin thing. Let me know.
Ah. I see. In case you want to change your username, then, please message me.
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I’m just wonder why I can’t change it
Ok. No worries. In these cases you can also look in discourse meta for answers:
may i chnage username, please ?
nvm, im good with that.