Before I can tell you how it works...
I need to know what it is. A photo will prob'ly tell me that...but make it a photo of everything BUT the bowl...all bowls look alike. Meanwhile, don't use it again till we figure out how to get the flush water flowing...'cuz if it has an impeller intake pump--which most electric toilets do--running dry will destroy the impeller in it.As for how to tell where the discharge is going, you're gonna have to explore your boat to see where the discharge hose goes--to a tank or to a thru-hull. While you're exploring, you should also trace the intake line to its thru-hull to determine whether the seacock on it is open or closed...a closed seacock would prevent the toilet from pulling in any flush water.In fact, it would be a good idea to find ALL the thru-hulls, fuses and breakers on your boat ASAP...and check all the hose connections...'cuz an emergency is not the time to START looking for the source of the water that's rising in your boat or how to turn off power to equipment that's smoking.