Hi @Anonymous User,
It sounds like you didn't complete the account registration.
Can you please use a pc/mac or laptop and sign into your account on the NOW TV homepage and then scroll down to movies or entertainment (depending on which one you want) then select "buy pass" and follow the onscreen instructions to complete your set up.
If you haven't applied your 3 month voucher code, you'll get the option during the process.
Please let us know how you get on.
The NOW TV Team