You can cancel your subscription through your PayPal History page.
Here's how
Log in to your PayPal account.
Click the "My Account" tab.
Click the "History" subtab.
Click "More filters", select "Subscriptions and agreements", and then
click "Subscriptions".
Change the date back to the year the subscription was created, and then
click "Show".
Click "Details" next to the subscription.
Click "Cancel Subscription".
