How do I turn off membership autorenew / cancel my membership?
Note: If you cancel your membership and allow it to expire without renewal, re-subscribing will occur at the new membership fee rate. Renewing your membership before its expiration (whether automatically or manually) guarantees your original membership fee rate.
You can turn off membership autorenewal in your account settings if you don't want your credit card charged for another year when your membership expires.
Login with your membership account, go to the ACCOUNT menu, and click Billing Settings:
From the Billing Settings page, click the cancelation link and follow the instructions from there.