No option to change username

I was trying to see if it was possible to change my username but there is no option to do so on the website?
Do I have to contact an admin on the website to change my username?

Best you can do without contacting an admin is the “real name” box in settings
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This shows up as the main name next to your profile, with your current name smaller in the corner
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Changing your actual username is admin-only.

Who should I contact to change my username?

The only mod I know of is @Jakb but I don’t know if they deal with stuff like this. It won’t hurt to send them a message I think.

send me a message with what name you want