Utorrent not working, port confusion.

so uTorrent was working fine for a while, but now it has suddenly decided to literally go as slow as possible. i am trying to download a 360 MB file, and the ETA is 1 day 23 hours. i am just confused about ports and ip addresses and all that hoopla. im running 10.6.7 on a 2.4 GHz Intel Mac. could anyone explain to me how to get utorrent working again? or explain some things to me so i can learn about it? thank you so much.