I selected this option when I signed on earlier. I wish to cancel. I haven't used the service and don't plan to.
By "option", "cancel", and "the service" are you referring to the Live feature?
FAQ: What is TurboTax Live?
If you want to remove the Live option from your online product, see this FAQ and choose the method that applies to your situation.
FAQ: How do I remove TurboTax Live?