I need to know, in Turbo tax, where do I. go to remove my answer that I did not get my third Stimilus check?

If you have NOT e-filed yet you can go to Federal Review for the questions about the recovery rebate credit.   If you already e-filed you cannot correct it.   The IRS is checking for mistakes on line 30 for that credit.  If you made a mistake they will correct it for you.   That will delay your refund.