I have had a look on the website but cant find anywhere how to add a second sky box to this package
Please take a look down below:
If you're on the Sky Digital Satellite Platform, you can watch BT Sport at home on a second TV if you have BT Sport Second Box. You'll need a second Sky box and second viewing card to order.
If you've got BT Sport HD, you'll be able to watch it on both your boxes. You won't need an extra BT Sport HD subscription.
You might have to have another viewing card from Sky them self, do you have one of them already?
Yes I already have two sky viewing cards