TurboTax is trying to renew my previous subscription, but I have chosen a new company. How do I cancel a subscription?

I have searched help and this section for every combination of "subscription" and "cancel" and "renew" that I can think of. Apparently Ituit does not want me to know how to close this account! Can anyone guide me? The fact that there is literally no way to communicate via email is one of the reasons I have gone with a different company.