More specifically (because it is really hard to find), go to paypal.com and log into your account.
On the My Account tab, click Profile.
Under Financial Information, click Pay List.
A Pay List Overview page should come up and you should find your subscription to EN World listed there (under Russell Morrissey). Click on that transaction to get the Billing Details, and right at the top under the Billing ID Number you'll see Status with Active and a link to Cancel. Click on Cancel and follow any further instructions.
Hope this helps.