Unfortunately, the only way to change your Roblox username is to pay 1,000 Robux. This applies to all platforms, including PC, Android, and Xbox. However, there is a way you can change your username and get the most out of the game for your money at the same time.
Changing Your Username
On Roblox, you can change your account's username in the account settings. It costs Robux to make this change. However your Display Name is a free option to change how your name appears in an experience or game.
How do I change the username?
Log into your account
(If you can't log in, try these steps for recovering your password .)
Past Names
A list of previous usernames can be found on the Account Settings and Profile pages, along with People search. You can change back to a previous username, using the above method, which also costs Robux.