Login to your Paypal account. You can cancel a subscription by going to the subscription Details page.

Go to the History subtab of the My Account tab, choose the Subscriptions field from the Show drop-down menu, and click the Submit button. Click on the link in the Status column to view the Subscription Details, and click the Cancel button on the Subscription Details page.

1. Login in to your PayPal account, and click on the Active link in the Status column for the subscription that you wish to cancel.
   
   You can also get to the Subscription Details page by clicking on the In reference to link in the Transaction Details for any subscription payments you receive.
2. To cancel this subscription, you can click the Cancel Subscription button and follow the on-screen instructions.
   
3. The Subscription is now listed as Canceled in your transaction history
   

If these steps do not work: You may have a different display selected in PayPal. Try logging into the site and going to My Account->Profile->My Money, click "Update" next to "My Pre-approved Payments" then select the subscription you wish to cancel.