After you file

When I try the Search feature in TurboTax , I see the same choices as you, but at the bottom of the window I have the opportunity to Type or ask something.

Likewise, when I'm entering additional interest income, the button is gray for any area I've visited previously, such as Interest Income, and it's marked Update so I can click on that if I need to make changes.

And on the screen Let's finish Pulling in your investment income,  I can add investments  by clicking the button at the bottom of the screen.

I think that possibly you are working on a smaller monitor/screen and not seeing the entire screen. I found that when I moved my program to a smaller screen, I saw the display the same as you show. However, I can scroll down to see the buttons that I need to click in order to enter a question, or add more interest income.