How do I cancel NHL gamecenter ?

You need to go into your iTunes account via computer, manage subscriptions

Vazandrew is right. Here's more details on how to mange subscriptions for services on Apple TV. This shows how to cancel Netflix, but the same method is used for NHL.

Thanks vazandrew & iostv. Just to clarify, if I purchase NHL Game Centre via iTunes can I get my money back before 5 days if I want? The FAQ at NHL.com read

"Purchases made using an iTunes account through the iPhone, iPad or Apple TV applications are subject to Apple's refund policy. "

Does anyone know Apple's refund policy for NHL Game Centre?

Thx

I would contact customer support for NHL Game Center. If they refund your money it should be credited back to your account.

NHL GameCenter LIVE™ Cancellation Policy

Subject to applicable laws, if you are a subscriber to an annual NHL GameCenter LIVE™ subscription package purchased atnhl.com/gamecenterlive (does not include purchases made through the NHL GameCenter™ or NHL GameCenter™ Premium apps on iPad, iPhone and other devices), you may cancel your subscription to NHL GameCenter LIVE™ within 5 days of subscribing, and receive a refund of the subscription or installment price; provided that if you sign up for NHL GameCenter LIVE™ again after cancelling, NHL Interactive CyberEnterprises, LLC (NHL ICE) reserves the right to deny further cancellation requests. You may cancel your subscription by contacting NHL GameCenter LIVE™ customer support at 866-210-6349 (US and Canada) and +1-407-708-1356 (Outside of North America), from 9am to 2am ET daily.

You will also want to make sure the subscription is canceled in iTunes.