It is suggested to erase the already existing code of the Shipping confirmation email and replace it by this one. But when I preview it, it's just blank. So I sent a test mail to myself and sure enough, it just sent me an empty email. There only is a subject line in which you can see the product order number but that's it.
I need it to work so my customers can get updated automatically about their order and the tracking reference and it is suggested in the video to use http://www.17track.net/en/track?nums= .