After 90 days you may add a signature to your profile, to be displayed on the forums (and yes, the links are still No Follow).
After you’ve reached 25 posts, you can use a personalized avatar. An avatar is a small image that can be included in your user profile. The maximum size for avatar images is 75 by 75 pixels.
You cannot use your avatar as a means of advertising.
The SitePoint logo, in any variation, cannot be used by anyone who is not a member of the SitePoint staff.