Trying to add investment (1099-B) to amend filed 2024 tax return but nothing shows up

I need to amend my filed 2024 tax return after realizing that I forgot to report one 1099-B form. So I used `TurboTax 2024` desktop app to amend my tax return.

I clicked "update" for the "Federal Taxes > Investment Income > Stocks, ....". And then I clicked "Add investment" in hoping that I can add the unreported 1099-B form. However the next page is blank and nothing shows up for me to add anything here.