@ wrishel
Online TurboTax no longer has a "My TurboTax" and label "Tax Timeline". They changed to a new design a few years ago.
If you are at the Tax Home, you are already at the right page. You may need to simply scroll way down further on that screen. On that Tax Home page (your screenshot,) scroll way down while looking for a link "Add a State." (That doesn't really add one; it just opens the return interview back up.)
If you don't see it, then near the bottom of that Tax Home page see if you can choose "Your Tax Returns & Documents". Then choose tax year 2024. Then see if you see "Add a State."
NOTE: When you open up your return interview, do NOT make any changes in it. If you end up needing to make any changes, you need to do it through a formal amending process, which is done an entirely different way and which must start off with your return in it's original as-filed condition.
