greenwhonix is right. the issue you are likely dealing with is related to the majority of torrent trackers requiring a udp connection. since tor does not support udp, and the gateway forces everything over tor, simply installing a bittorrent client in the workstation and expecting it to function transparently will not work.
there are a number of technological measures you can employ to deal with this limitation inside the workstation. however, due to the fact that a sizeable portion of the tor community frowns upon bittorrent over tor, particularly due to the implications of piracy and the problems it causes for tor exit node operators in various locales, direct instructions on how to do it aren’t casually offered. the answer i’ve mor commonly experienced is “rtfm” which, i imagine, is to not hand out an easy paint by numbers approach for the unknowledgeable to simply download pirated movies or games.
however, the fact remains that it is doable. if you do it, please do it sparingly. torrent activity can cause a significant amount of bandwidth to be used up, which can harm the tor community at large. additionally, if you are planning to use it for piracy, understand that you are putting an exit node operator in the position to be harassed with copyright complaints, since it will be their ip address that is initially discovered. finally, understand that, due to the number of connections your client will make, among other factors, as a direct result of the nature of how the bittorrent technology operates, it has been speculated that downloading and sharing torrents over tor may make it much easier for various types of adversaries to break your anonymity.