How do I file state taxes from 2015? This was never submitted and I received a notice of deficiency.

I spoke with someone from the IRS and they are asking for me to file 2015 state taxes and the fee associated will go away. (Around one thousand dollars.) I filed them through here. The state taxes did not go through, and I did not catch it. It was one of the first times  I filed.  I'd like to do it through Turbo so I do not miss anything. Is this possible? How?