You can change your username from Settings, Account, Change username.
What changes with it
Your public URL: melo.bio/oldname becomes melo.bio/newname. Old links stop working immediately.
Rate limit
You can change your username once every 30 days. We do this so people do not lose track of who you are.
Reserved names
Some names are reserved (system routes, brand terms). If yours is rejected, that is why.