I don't know which bittorrent client you installed (bittorrent, bittornado or azureus) so can't tell you what to do. However, you would have to place the .torrent file anywhere you like and then start your bittorrent and open that file. I recommend you use azureus which is a java-based bittorrent client...nice and easy to use.
I think you can only use the command line with the default bittorrent.
Corrections and additions to the above:
Although the "btdownloadgui" would require wxPython or wxGTK...most probably wxGTK. You can get those packages at www.linuxpackages.net
Link to a useful article