Here's how:

1. Log in to your PayPal account.
2. Click Profile (the gear icon) on the top right corner of the page.
3. Click Pre-approved payments under "Payment settings".
4. Select the merchant whose agreement you want to cancel, and click Cancel.
5. Follow the instructions to cancel the agreement.

If you don’t have a PayPal account, you should contact the merchant directly to cancel the agreement.

If you can’t contact the merchant, please call us. Here’s how:

1. Go to the PayPal website.
2. Click Help at the top of the page.
3. Click Call Customer Support.
4. Click contact us without logging in for our Customer Service phone number.

Please note that after canceling a payment, subscription, or automatic billing agreement, you are still required to pay the merchant for the goods or services you received. A subscription can be cancelled up until the day before the next scheduled payment in order for you not to be charged.