If this your first time filing a tax return and you didn't file to get the stimulus payment, you need to select a different option when you get to that question in TurboTax. Follow the next steps to get back to the AGI section:
- Open your return and on the left menu select File
- Go to Step 3 and select I want to e-file
- Continue to Last year's tax info and select Edit by your name
- Follow the questions until you get to get to the question We need to check your adjusted gross income
- Make sure that you don't select didn't file but used the IRS tool to get the Stimulus payment and instead select I didn't file last year
See the images below for more details on the steps to follow: