1) First thing you need to do is login to your account. Click on the login / account link in the footer of the website, see image below. (Note: You can click on the images to view them in full sizes).
2) After login, you will be redirected to your account dashboard. On the left sidebar menu, you will see list of different sections related to your account. Click on the one that says My Subscription.
3) You will be redirected to subscription details page. Click on the “Cancel” link to cancel the subscription.