Enter the Form 1099-S in the "Stocks, Bonds, Mutual Funds and Other" interview under Federal Taxes > Wages and Income > Investment Income.
There is no "1099-S" interview, so you will enter it as a sale where you did not receive a Form 1099-B (see attached sample screenshot).
Complete the interview, indicating what the payment was for (Property Settlement), how you acquired it (Divorce) and set your former spouses' "Basis" to the amount reported on your 1099-S (see attached sample screenshots).
The program will show your "gain" on this transaction as "0".
