Cant watch videos anymore

hey I was stoked to be able to watch the last of the DBZ series that i missed as kid. i watched a few before getting the LIMIT message and i was prepared to wait the day or so before i could continue watching episodes. That was 2 days ago and i still haven't been able to watch any new shows so i was wondering how i might go about fixing that.
the message said something about upgrading to premium but i can't find the link to do that so I'm lost.

PLEASE HELP
thanks