You either have a SMS Mac subscription through PayPal or eSellerate.

How do I cancel my SMS Mac subscription with PayPal?

To cancel your subscription or have a quick look on the status of your subscription, please press the Unsubscribe button below:

 

How do I cancel my SMS Mac subscription with eSellerate?

• Go to the After-Purchase Services web site of eSellerate
• Fill in your order number and email address
• Once logged in, look for the Subscription Management section
• Click the Cancel link