Hello Olfa,
The SS executables (ss.exe) need 4 input files in order to run. There are example input files in the Examples folder in the Document Library.
Please view the SS Getting Started PowerPoint (https://vlab.noaa.gov/documents/259399/1933916/SS_getting_started.ppt/7a952663-fbdb-78ae-cba3-a676ff45f37c) and let us know if you have further questions.
-Teresa