Insert hose in the intake manifold.
No really - the basics of running the JS on hose is that you need to start the motor first - most important!!!
In that picture I don't see the usual hose fitting for running it on a garden hose - so don't go putting water in any of those hoses/wires (unless you want a 3 stooges like reaction).
After running for like 10 seconds revved to the moon (you don't have to do that) you should be able to find a (granted, this is only true if the chap before you put the part on) hose right neat the head of the motor that has a hose female threaded attachment, always with a plug (unless it's a fancy quick disconnect, which is not likely on a JS).
Attach the hose there, but don't start it until after the motor is running. Make sure you stop it before you turn off the motor as well - and then you can rev it to clear the engine of the water after the hose has been shut off. Just don't power rev it dry - but you probably already know this.
It this the hose with the white clamp on it running into the exhaust manifold?
