Is there a process for inputting changes in the pink high-lighted squares

after review of my state taxes (OK), Turbo has asked me to insert numbers/letters into the pink high-lighted squares shown on screen. How do I make the changes? Where do I make the changes?  When I insert the number/letter into the high-lighted square, it doesn't take. I can't get my changes to take hold from the screen provided. Do I need to access from another area  or form?