If you want to change the port,username or pass Web UI you must go to uTorrent settings via VNC. Go to Options -> Preferences -> Web UI or just use Ctr+P. Then you will see:
Now you can change what you want and then you click OK or Apply. if you want to change the port, we suggest having a number which is one digit higher or one digit lower, then in your uTorrent Web UI link which you use in your web browser you must change the port into the one you changed in settings. So if you changed it into 8081 the link must look this way http:IP_box:8081/gui/ ,the port number is behind the colon (:) .