Please follow these steps,
1, locate the desired audiobook(s) on your drive,
2, use your bittorrent client to create a torrent file, (for more help, check out http://torrentfreak.com/how-to-create-a-torrent/
). If you wanna find some open trackers, you can use the following,
3, login to the user center and click "share my audiobook",
4, fill in some necessary information on the page and upload the torrent file.
5, download the torrent you just uploaded and START it in your bittorrent program.
6, Keep SEEDING as long as you can.
PS: If the torrent file was grabbed from other place, you'd better give credit to the original uploader.