You're able to manage your subscription, including cancelling it from the user dashboard.
To do so, click the 'User' icon at the top of the website and select 'Customer Login':
If you didn't create a user account when you setup your subscription, you can do so by clicking 'Register' and entering the same e-mail you used to setup your subscription:
Once you've done this, you'll be able to manage your existing subscription.
Cancelling your subscription
- Log in to your account
- Click the 'Subscriptions' tab
- Click 'View Invoice' for the active subscription
- At the bottom of this window, click 'Cancel'