Do you mean you can't get anything from that link to the forum?
http://forums.ytmnsfw.com/showthread.html?t=82337 is a thread with multiple users in it all with image names. Again, not safe for work. Not sure if you meant you can't get anything just from looking at the forum or not but there's that just in case.
Also I can tell you that the users don't set them themselves, the admin was the one who did it. I had a picture name when I posted there and there were no options to set it our self, we'd just post what we wanted and if we were lucky he'd set it.