Which are you asking about -- Last Minute Rentals here on the Bulletin Board, or in the Timeshare Marketplace?
The Bulletin Board is not connected to the Timeshare Marketplace. If you want a Last Minute Rental listing on the Bulletin Board you have to post it there yourself. The LMR forums are forums just like this one. If you know how to post here, which you obviously do, you know how to post there. Please review the forum-specific posting restrictions shown at the top of those forums before posting there.
I don't know about the Marketplace, but somebody should be along soon that does.