Please note that uTorrent Plus can only convert media files (video or audio). Game and application files are not supported and cannot be converted.
If you have added an Xbox to your device list, you will see it in the left hand column under "devices". Click on the torrents tab and find the file you would like to transfer to your Xbox. Once you have found it, click and drag the file on top of your Xbox tab.
You can also right click on the file and choose convert for > XBox 360.
If the file needs to be converted, then you can click on the conversion tab and see the current progress.
When the file is done converting, click on the Xbox tab. Insert your USB Stick in to your computer. Now select the file that you recently converted and click the "Transfer selected files to storage" button. This will bring up a window that allows you to select which external device you would like to transfer to. Select your USB Stick and continue. The file will then transfer to your USB stick.
When it is done, you can plug that USB stick in to your Xbox and select the file for playback. Please consult your XBox manual for more information on accessing files from your USB drive on your XBox 360.