To make your Real Name display instead of your "username" follow these instructions:

If you want your name to display throughout the site as First Name only or First Name Last Initial you can change your username that you use when logging in by following #1 & #2 below. Change your "username" to your Real or Display name. The enter your "username" for logging in into the field named "Alternate Login" that I recently added so you can enter a "username" that is familiar to you for logging in. Here are some detailed instructions:

1. Click the "My account" link in the left side menu.
2. Click the "Edit" tab on your "My account" page.
3. Change your username to your Real Name (or First Name and Initial, or anything else you want others to see).
4. Scroll or look down the page, below where you can enter/change your password. Under "Alternate Login" enter the username you'd like to use when you login (this is usually something obscure or an abbreviation or email address).