After purchasing a Premium Subscription, it is important that you either refresh our app (using the refresh button in the Library view of the app) or completely quit the app (by holding down the PlayStation button and selecting “Close Application”). Our app only validates your subscription when it first opens or when it refreshes, so it won’t know that you have updated your subscription until you perform one of those actions. We are working on improving this experience!
If the above steps still don't unlock the appropriate features please let us know the username and email you used when registering and we'll dig a little deeper to find out what's going on.