I erroneously entered $0 in stimulus payment I received when going through Turbotax Interview the first time. I have tried the fixes suggested by users, but when I search "stimulus" in Federal Review and click on the link to Intuit nothing happens,

If you have already filed your return, you can't change your entries in the Federal Review section regarding stimulus payments.

The IRS is making corrections and they will send you a stimulus payment even if you didn't claim it on your 2020 return.

Click this link for more info on the Third Stimulus Payment.