Firing
First before firing you need the following: -
Deodorant or hair spray
A spud
Something to ram it down with i.e.. A wooden dowel
Stage One
Open one of the end caps and shove a spud down the barrel. The barrel should cut the spud to the right size for the barrel. If not go to Modifications. And then use the dowel to push it down to the T adapter.
Stage Two
Open both caps and squirt about 1 seconds worth of spray in thru the open end cap and quickly close them both or you will lose the propellant.
Stage Three
It's ready to fire, so aim away from people and valuable stuff and push down on the igniter and if all went well your hear a loud bang as the spud launches itself up and away.