What do you mean by disconnect or turn off? If you are referring to your account, it will continue to exist once you have signed up. However, you will no longer have access to the returns under your account once your subscription for the year expires unless you renew it.
If this is not what you are looking for, please come back to clarify your question.
---------------------------------------------------------------------------------Still an AllStar
I assume it has expired since I continue to get emails to renew. I used on only one return to see if I wanted to use the app. I do not. When will the renewal emails stop?