After you file

Have you filed yet?  If you haven't filed......

To get to the stimulus questions in TurboTax at any time, you can search for stimulus or recovery rebate credit then hit ENTER and there should be a Jump to link

 

If you are trying to trigger it,

Click on Other Tax Situations at top

Click on Let's get started

Answer some questions then Continue

Then click on Let's keep going

Next screen is for the Third Stimulus, if you qualify