You can cancel your subscription from your Paypal transaction history.
A subscription can be canceled up to the day of the next scheduled payment.
Here's How:
Log in to your PayPal account.
Click History at the top of the page.
Select Subscriptions from the Show menu.
Check the From box and change the date back 2 years.
Click Search.
Click Details to view the details of a specific Subscription Creation.
Click Cancel Subscription.
Click Cancel Subscription again.