No problem, Mychal!
Click on your Profile (just under the WWG banner), and scroll down to the bottom of that page. You'll see an area called "Avatar control panel."
At this point, you've got two choices:
1) Click "Show Gallery" and choose one of the images that are there.
2) Click "Choose File" and upload your own image from your computer.
If you choose your own image, make sure it's not too big (dimensions or file size). The limit on file size is 20k, so you know.
Enjoy!
[edit] If you're taking about the ones with a WWG banner and titles, etc: those come at 250+ posts, marking you as a top poster.
You can also get them earlier, by making a build so awesome that it gets showcased on the main page (at the bottom, under "User Build Spotlight."
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