Basically, once you figure out the answer to the riddle you send a PM to the person who posted it (aka The Riddle Goddess, in today's case, firstmickey).
If you got it right, you get a TU ("thumbs up") like the ones you see posted in the first couple of pages here.
After that, we just kinda joke around and have fun. The riddle gets kinda slow in the evenings, but every weekday morning, there's more fun to be had.