I saw this in another RP that I'm in and I wish all of them had one. You pretty much give a synopisis/summary of the plot you have in mind with the genre and kind of people you're looking for. It can be for a single other person or a group, whatever you like. This room, though, allows others to request to rp with you using that plot.
I just used way too many words to describe this room... T-T
Admittedly, below are the exact rules from the other RP:
1 . Leave a post with your plot, explained in at least 3 sentences (the more detailed the better).
2. Include in the post criteria for character(s) you're looking for to help with the plot (what should be their role in the plot, such as romantic/fluff, , pick your genre almost).
3. Doesn't have to be for 2 people only, can be for groups.
4. Plots and their authors will be uploaded below, available to see for others, and if someone is interested in a certain plot, they can comment as well and volunteer for it.