On the ePG, if you press the blue button, you can scroll across the top menu bar to select 'subscribed channels'.
Unfortunately this does not work. If I choose 'subscribed' I still see a lot of Now TV channels I am not subscribed and if I click on any of them I am asked to subscribe. That feeling again I am paying for a beta version product.
I got the 7 day free trail for Paramount + a few weeks after it first started but cancelled it. As at time I thought there was not enough content on there to pay for it.
I also cancelled BT TV just over 10 months ago when TV contract was up and went with Now direct with discounts.
In just under the last 2 years I now use my Amazon Fire HD sticks for apps.
Youview/BT seems to be slowly fallen behind with the lack of some apps.