go to your admincp (
http://sitename/admincp.php ) and type your username and password. In there you can change your torrent folder.
If you prefer to do it the PHP way, then find and open admincp.php in your root and go to about line 125, and change the linie... mine looks like this:
Code:
array('Torrents','path','dirtorrents','$torrent_dir','Server path to torrent folder (complete or relative, no ending slash)','torrents')
The last 'torrents' is the name of the torrent-folder :)