The following are instructions from PayPal on how to unsubscribe:

How do I cancel a subscription?

Canceling a subscription cancels all future scheduled payments of that subscription. A subscription can be canceled up to the day of the next scheduled payment. Please follow the instructions that match what you see on the site.

1. Log in to your PayPal account.
2. Click Profile near the top of the page.
3. Click My Preapproved Payments in the Financial Information column. (Don't see this step? Follow the instructions below.)
4. Click View the Agreement next to the merchant agreement you want to cancel. (or click the applicable Merchant)
5. Click Cancel or Cancel automatic billing and follow the instructions.

Or

1. Log in to your PayPal account.
2. Click Profile near the top of the page.
3. Click My money
4. Click Update in the My preapproved payments section.
5. Click Cancel or Cancel automatic billing and follow the instructions.