The Keyboard Jog On/Off button is not functional yet. If the keyboard plugin is enabled and configured it is on. First, enable the Keyboard plugin . Then assign the jog inputs to the keyboard for device in Config/Mach/ Input signals, close Mach and reopen then configure your keys in the keyboard plugin (they must have a name. I just named them X+, X- etc.). Then close mach and reopen again. The jog keys you assigned should now work but you can only turn them off by disabling the plugin.
Brett