I think you mean you had a "capital loss" for the sale of the land. I think that is entered in the section for Stocks, Bonds, etc.
I am assuming you did not use TurboTax last year and/or did not import your information from last year's TurboTax, right? Because that should automatically carry over.
As a side note, this land was not used (or meant to be used) for personal use, right? Because personal use would make the loss non-deductible.
