You cant change your username, but you can change your name by going to your profile and clicking edit.
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@PYer But if they send an email to [email protected], they can change their username if they signed in with Google. This was an issue and they resolved this by allowing users who signed in with Google to change their username since it was a bug that they weren't able to confirm their username before signing up.
Please mark this as answered if I helped your problem 👍
(PS: I'm pretty sure @Kognise had removed the username from a repl url: example.repl.co, but I'm not sure how he managed to do it)