Question ealier about stimulas said how much it 4200.00 correct i said no put 3000.00 irs would flag if wrong i think i put the wrong answer and i cant find it to fix it

@samm728590 Your question is pretty confusing but I think you are trying to say that you received $4200 for the 3rd EIP payment and only entered that you received $3000?    

Not sure if you are actually asking about the child tax credit advance payments or stimulus money since $3000 is not an amount you would have received for the stimulus.   

Have you e-filed yet?   If you already e-filed then you are just going to have to let the IRS sort out whatever mistake you made on the stimulus or child tax credit.   The IRS will cross check and fix it but you can expect a delay and a longer wait for your refund.

If you have not e-filed----if the mistake you made was for the stimulus----the $1400 per person --- you enter that for the recovery rebate credit in Federal Review.

If you are asking about how to enter the advance child tax credit payments:

Federal>Deductions and Credits>You and Your Family>Child Tax Credit

The IRS is sending out letter 6419 to you.  It will show the amount of advance child tax credit that you received during 2021.  Enter the information from that letter carefully.   

The remaining amount of CTC that you can receive will show up on line 28 of your 2021 Form 1040.   Then it will calculate down to the refund you see on line 35a or the tax due on line 37.

PREVIEW 1040

https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing

Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.

NOTE:   The CTC is indeed a “credit” that can be applied toward any tax liability that you would otherwise have to pay as “tax due”  to the IRS.