Once the SboxrDOM.zip file is extracted, go in to this folder and launch Sboxr using the launch scripts.
Run launch.bat on Windows
Run launch.sh on Linux or Mac
This will launch Sboxr, once Sboxr starts it will show the URL of the Web based UI in the command line.
Open a browser (Chrome is recommended) and visit the URL shown in the command line, by default this value is http://localhost:3333