scgibbs, this isn't a swap this for that type swap. If you go to the main swap page:
https://garden.org/apps/swap/ and click "our video tutorial" you can watch a youtube video as to how the computerized swap works.
You list your seeds and when the swap opens, bid on those you want with so many "tickets" the host grants the first night, and earn more tickets for seeds you "sell" to others by their bidding.
CHeck it out!