Is this possible? My username must have been based on my Gumroad purchase account but I would rather not have my full name as my username.
You can change it yourself in the Profile Panel (click on your picture, choose Profile, then preferences).
You'll get a warning about @ references not linking up. Click Save Changes on the bottom of the page, and you're good to go.
This allows you to change your "name" but not your "username" which seems to be hardwired.
What would you like it to be ? It seems as though with my superman admin powers I can change user names.
ps Captain America is awesome, Superman is better