How do I stop recurring payments?

When subscribing for a Premium Membership, users who choose to utilize PayPal as the method of payment, may schedule recurring renewal of the subscription by opting in to PayPal's "Pre-approved payment system". These scheduled transactions can be canceled at any time by accessing the "Pre-approved payments" options found in your PayPal account settings. 

More information can be found on the PayPal website:

Users who choose not to use PayPal will only be charged one time and are not eligible for automatic subscription renewal.