Off Topic: How can I change my User Name?
Click on your name (<<<< text to the left, or simply "Profile" tab above ^^^^) then hit "edit".
(shows as "back" in my pic)
Internet Explorer doesn't allow me to edit, so I use FFox or Chrome.
A pic reveals all. 😉
edit – When you first sign up, it asks for first and last names. (in two boxes)
Then joins them together when displayed.
You can enter your display name in two parts, or simply edit later. 😉