My son has an Iron King Steam train and wants to use the smoke that came with it.  We can't seem to find the instructions and are afraid to just put the liquid into the funnel.  We've read through threads on this site regarding using the smokers and see that locomotives with smokers have switches to turn them on.  We don't see any switch and can't find anywhere to open up the boiler/smoke box.  Does the Iron King have a switch?  Do we simply put the liquid into the funnel?

Thank you,
Cam's Mom