In order to use Segrada, download the program and unpack it to a folder of your choice.
On Windows, start the application with Segrada.exe. On Linux, Unix, and Apple Mac OS, run start.sh (you might have to make this file executable).
A window should appear which can start the actual application. Press "Start" and wait for the button "Open Application" to become active.
The application runs in your browser. You can stop the application by clicking "Stop" in the control window or by closing it.