Hi @Saund_1
From the NOW App home screen on your smartphone click on the gear wheel icon top right, then sign in with the NOW Account login details that has the Mobile Sports Membership on it.
Also make sure you watch from Sky Sports Premier League and not Sky Sports Main Event.
Did you get it sorted? If not, you're not missing much, dreadful game so far. 😕
Me and my big mouth, seriously picked up in the second half! 😄