If you want to add an avatar to your profile, here's how.

Go to your user account ( My account on the right side), click edit.

below your signature, where it says picture, you can find an upload button.
Take note of the size and pixel requirements, it won't do large pictures.

If your looking for an image on the innerweb, use google images.
On the left column, you can choose the size, put 80 in the width column, and sort through until you find a properly sized image.

Download it to your desktop, and then upload it using the button below the signature.

Your image then goes into the approval queue, so don't expect it to be instant.

There is an error in pink, but ignore it, we are due for a version upgrade so this will go away.