No idea where you got the ability to change your username, because I've looked in my forum profile, and it doesn't allow me to change it.

EDIT: Never mind. Apparently you have to click on your username on the forum, and not go to your profile page. Doing that, you can change your name.
This post was last edited by GalaxyRed at 2016-7-24 15:25

Like I said in my edit, I already figured it out. But I guess it'll help others. lol