The keystroke is the letter S by itself, insert + h is the help command.
Since I wrote these scripts some years ago they have needed to be recompiled to make them compatible with the newer versions of JAWS. They are at present compiled with JAWS version 8.0. If you are using an earlier version then you may receive a compatibility error. If that happens just hit insert+F2 and arrow down to the script manager. Hit enter and when the source Script file loads hit control+S to recompile them. It will only take a second to do. JAWS will say compile complete, then hit
alt+F4. Your error shouldn't occur again. Please review the file installing scripts to learn where exactly they need to go in order to work properly. Note: these scripts do not work with IE 7.0.