How do I get a forum avatar picture? Does the Gravatar still work?

Your forum pic can be set from within your profile settings.

Go to your profile and choose 'Forum Profile Information' on the left side of the screen. You'll see three avatar options now. The first one is the Gravatar. If you already have a Gravatar, make sure your email address that's registered here is the exact same adress as your Gravatar email adress! If that's the case, you'll see your Gravatar pic, and you just have to click the radio button in front of it.

Besides the Gravatar option, you can also choose to upload a picture, or link to a picture on an external site. The default size of an avator on this forum is 65x65 pixels.