Visit the "Prevention" website.
Scroll to the bottom of the page.
Click on "Customer Service" located in the "Help" section.
Log in to your account. You can log in two ways. You can either use your account number and expiration date or your full name and address. Your account number and expiration date can be found on the magazine's mailing label (located on the cover of the magazine--bottom right corner) .
You can cancel your subscription online. Click "Cancel My Subscription" on the menu located on the left of website. Follow the on-screen instructions.
You can also cancel your subscription on the phone. Click "Contact Customer Service" on the menu located on the left of the website. Call the number provided.