To get started with Microsoft account aliases, you'll need an Xbox Live gamertag and access to a web browser.

Type in your email address that you used to sign up to Roblox and then press the Submit button. You will then get an email and you will need to click the link you get in it.

To get or change a Roblox Display Name, you should first log in to your Account Info page under Settings, then select the edit button next to the Display Name entry above your Username.