For those who don't know what this is all about, it's something we used to do a long time ago when there was more activity on the site.
The way it works is that one person puts an item to give away in the forum post. If somebody wants it, it's their turn to put something for sharing.
The taker pays the postage for the item (it's negotiated as a personal message).
If an item "sticks" and finds no taker after a few days, you either have to put something else up or the game ends there and we have to go for another round.
It's that simple.