The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check in 2020, you can get it when you file your 2020 return in early 2021
The Recovery Rebate Credit will be found in the Federal Review section, If you are eligible it will end up on line 30 of your 2020 Form 1040.
That's what the software does. You enter all your income, deductions & credits for the entire 2020 tax year, and the software creates a form 1040, and any needed attached schedules.....so that it can be filed to the IRS and state (if your state has an income tax).
It's not a piecemeal process, so don't file until absolutely every scrap of your 2020 income has been entered. If you don't have all your W-2 or 1099 forms of various types yet, you have to get them and enter them into the software BEfore you file. Don't attempt to file until sometime AFTER 12 Feb in any case..