Usernames are used to log in and to help find specific people on the platform. Display Names are not unique and are free to change every seven days. ... Display Name Set-Up
Roblox now allows all users worldwide to change your Roblox account's display name in the account settings as a free feature. This is different than Changing a Username.
How do I change the display name?
Log into your account
(If you can't log in, try these steps for resetting your password .)
What else should I know about display name changes?
Your display name and username will be visible on Roblox and associated experiences