You can cancel your subscription as follows ...

Step 1 - Go to

Step 2 - Enter your billing email address. (When paid with Paypal this should be your Paypal email address.) 

Step 3 - Check your inbox.

Step 4 - Click on the "Cancel subscription" button.

If you don't see the Cancel subscription button, make sure you've selected the correct payment. Click the Billing History tab to find the correct payment.