These are for downloading torrents if you didnt already know.What you do is search for a film or music you are after on a torrent site such as piratebay or mini nova then click on it and download.It should ask if you want to open with bit torrent.Open with bit torrent and that is where it will begin to download.
Hope this makes sense? I am better at explaining without txt!
You aren't alone. I downloaded one and looked for ages how to use it, all to no avail. I did manage (dunno how) to get one thing downloaded, but it took ages and after that I couldn't be bothered. In the end I gave up and uninstalled it.
By clicking that link, then click mininova in the list of trackers at the top, then click 'Download this torrent' and open it, your default BitTorrent client will handle the torrent file and you can start downloading the data (687MB), Voilla!