Make sure that you always change your birthday, even if it’s a wrong one, to 13 years of age or older to be able to change it at a later date. How to change your age on Roblox account (PC desktop)?

Roblox allows all users to change their Roblox account's display name in the account settings without spending a dime. Here's how to do it.

Gamertag, username, display name; a Roblox player has multiple names, each having a purpose. Thankfully, usernames and display names chosen years ago can be changed.

To change your Roblox username login to your account and go to the settings section. In a browser this is represented by the gear icon in the upper-right corner.