How to credit in the icon's comments.
1. Click on "Your Pictures"
2. Click on "Browse" (on the pic "Parcourir" because my computer is installed in French) and select the icon you want to upload.
3. Insert some keywords that will help you find the icon in your user picture icon drop-down list when you're posting or commenting.
4. Insert in the comments the name of the icon maker.
5. Click on "Proceed".
That's it! You're done. When people browse your user pictures, they will now see this: