first you must download the torrent, locate the place where the files are downloaded to and then drag and drop the audio files into your iTunes library.
Edit: If you don't want to go through all that trouble every time you download, you can do this instead:
In uTorrent, go to options>preferences>directories and change where the files download to the "Automatically add to iTunes" folder. (Usually C:\Users\(username)\Music\iTunes\iTunes Media\Automatically Add to iTunes)
It works well if all you download is music and movies, and if something's wrong and it can't add something, it just puts it into a "Not added (insert date here)" folder so it's easy to find.
Then when you open iTunes next, the files will automatically be there and start sound checking and whatnot.
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You just drag the finished music from the Download folder in My Documents to your iTunes, just like you do normally.