Hi,
you can start in the help direcotory [your_install_path]\S32DS\help
Basically - projects in your workspace are visible on the left side (screenshot #1). You can open it by double click. Active projects are marked by arrow front of project name.
You can create new project from example or empty one: File ->New . If you like to add an existing project - you can import it into workspace: File -> Import (screenshot #2).
Jiri