Roth back door: Can some one guide me how to enter 2021 Roth conversion of $6000 in my 2021 return ? Thank you

Can some one guide me how to enter 2021 of Traditional IRA to Roth conversion of $6000 in my 2021 return? Turbo Tax kept warning me that I have excessive Roth contribution.

I can't see the same step as posted earlier