Q: Hi I had no idea you had to pay for this..? Does anyone know how to cancel it and get my money back?

How long ago did you subscribe to it ? I'm not sure how may days after subscribing that you can get a refund, possibly 14. The page that you posted from has instructions for how to turn off auto-renewal.

You can try contacting iTunes Support via this page : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption