Unlike programs like Kazaa you don't use the program itself to search for files to download. You use your internet browser to find and download a torrent file. When you download it select the "open with bittorrent option" which is default anyway. Then it will show up in bittorrent asking you where you want to save the file and after you click on that it will connect and download.
I have had good luck with btmon.com and someone above me already gave you a long list of other places to try so I won't do it again. You can also do a google search for the name of what you're looking for plus torrent.