How do I access my tax documents from the tax year 2017? I filed through turbo tax and cannot figure out how to access them. Do I need to pay?

I received a letter from the state of Illinois saying that I owe taxes from 2017 and I distinctly remember filing my taxes with the state of Illinois in 2017. I am trying to locate my 2017 return but cannot figure out where that would be located on this site. Anytime I open "Documents" and select "personal" it says "coming soon". I have 2 weeks now to respond and need these documents faster than soon.