As a DCA recipient, you are not subject to the ACA penalty.
Please read this document for further information:
https://obamacarefacts.com/questions/will-penalties-include-daca-recipients/
In the TurboTax health insurance interview, on the page titled
Did you all have health coverage in 2017? click on
I'll click who had it and which months (see attached screenshot 1)
On the following page, do not check any month if you are not covered.
Then on the page titled
Did anyone have a situation that waives the tax penalty for being uninsured?, click on
Not a legal U.S. resident (see attached screenshot 2)