Does your Letter 6475 say that you received the Recovery Rebate Credit?
On your Form 1040 that was e-filed, did you have an amount on Line 30?
If you do not have an amount on Line 30, then you have nothing to worry about. Letter 6475 is an informational letter and if you do not have an amount on Line 30 then you answered the question correctly when you completed your original return.
If you still want to try and get back to the screen and you used TurboTax Online the screen for the Recovery Rebate Credit comes after the "Other Tax Situation" then "Let's Keep Going". The next screen will be the screen it says Let's double-check the amount you received.
I would just put the letter with your tax papers.
