Open Roblox in your browser. Now login to your account.
After logging in, go to Settings. Settings are usually located on the top right side of the screen with a gear icon.
Open the Account Info tab.
Now, select the Change Username option. Make sure your account has 1000 Robux to change the current username.
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I Forgot My Username
This article will walk you through the steps to find your Roblox username if you had a verified email address or phone number.
Other ways
These methods will only work if there was an email or phone number added to the account before you forgot the username. The only other way to locate the username is if you made a purchase on Roblox. Some purchase receipts include the username.
Does the original account creation date carry over to the new username?
Original account creation date will carry over to your new username
Can you change your username on Roblox?
On Roblox, you can change your account's username in the account settings. It costs Robux to make this change.