Changing Display Name

At the top of the page in the left hand corner, you click sign in.

Once you're signed in, it automatically takes you to your home page.

On your home page to the right of your ID picture, there's a link that says Edit Profile.

Click on Edit Profile and scroll down until you see the orange words Identity.

Under Identity, you'll see Display Name.

Type in your Display Name then scroll all the way down to the bottom and click Save Profile.

If this didn't help, I'm sorry.