
change <<destination = 'F:\\Media\\Download\\'>> to your likings. Remember to use double slashs for your folder separation. This is the destination folder, where the downloaded files are stored. Remember to use a drive with enough space
c) change <<dirselect = 'E:\\test\\'>> to the folder where you have stored your .torrent files
d) change <<maxuploadrate = 0>> to what you want, 0 equals unlimited
the rest is irrelevant and does not need a change (at least not for me)
5) (optional) go to the BitTorrent subfolder and open the download.py in an editor
a) search (F3) the string "minport" (without the quotation marks) and edit the number after it to the beginning of the port range your client should connect with

a bit further in the file, right after maxport, there is the maximum port, usable by the client.
If you have problems connecting to the tracker and it keeps telling you "port 6881 rejected by tracker" or similar, you have to do step 5). If you don`t know shit about ports, edit it to something like this:
('minport', 5981, 'minimum port to listen on, counts up if unavailable'),
('maxport', 5999, 'maximum port to listen on')
6) now youre done. Open up a ftp connection to your box, navigate to your XBMC folder, open the scripts subfolder and put the bitxbox.py and the BitTorrent subfolder on your box.
7) in XBMC go to settings -> general -> scripts -> bitbox.py and hit the a button

BitBox should start to download the .torrent file given in 4 a) or let you select a file from the folder specified in 4c) if you let 4a) free.
If you don't see anything, you might have specified an empty (or invalid?) folder in 4c)
Hope this helps a bit (especially the part 5) is usefull if you have to change your port, as you have to search this information inside the files...)