The fastest way to get to where you need to enter the 1099-S is to:
1. Login to your TurboTax account
2. Click Continue Your Return
3. On the left side of the screen you will see Tax Tools, click that
4. Click Tools
5. Click Topic Search and enter in the search box 1099-S, click on it in the results, click Go
6. Follow the interview questions on the screen.
[edited 3/20/2020@7:05pm]