You will report on your 2020 tax year return that you received it. The payment is not "Clamed", it is not income, you just report whether you received it or not.
TO GET TO THE STIMULUS SECTION OF TURBOTAX:
Go into your account and click "Tax Home"
On that screen click "Other Tax Situations"
When the drop-down opens, click "Let's Get Started" or "Review/Edit" to move forward
There may be a delay when opening to this next screen
Scroll to the bottom of this screen and click "Let's keep going"
The next screen should read "Let's make sure you got the right stimulus amount" (If not, click continue to move forward until you do get to that screen)
Scroll down and click "Continue"
The next screens will ask if you received the stimulus, which ones and how much.
The software will calculate a credit if applicable.