This link will help you recover your return to make changes. How to review and update your 2020 return if you already claimed the RRC.
If you did not receive your first and/or second stimulus payment or if the amount received is not correct, you can claim it on your 2020 tax return as the Recovery Rebate Credit.
In TurboTax Online, to claim the Recovery Rebate credit please do the following:
How do I correct the amount of stimulus check I received?
If you need to change the amount of stimulus payments received and have not filed yet, you can follow these steps in TurboTax:
If you already file your return, you must wait until it is accepted before you can amend your return. For instructions on how to amend, please see How do I amend my 2020 TurboTax Online return?