Log in to your account here:
Once logged in, you will be re-directed to the "Members Home" page.
From the main menu, hover your mouse over "Mange My Account". From the drop down menu select "My Account"
Once you are viewing your account, you can see all your transactions and subscriptions.
Look for the "subscriptions" link. There you will see an option to cancel your subscriptions.
Click the cancel link and your subscription will be automatically cancelled.