I assume you haven't yet actually filed, but TurboTax "thinks" you were finished. So if you no longer have the "take me to my return" button, here's how to open the return back up:
Log in and go to the section "Your Tax Returns & Documents." If necessary, click that line or on the word SHOW to expand that section.
Choose 2018 tax year.
Click on "Add a State." (you don't really add one. That's just to open your return back up.)
