
Clicking the clicky bit should make a spark between the metal cappy bit and the end of the wiry bit. This is your ignition, sparks yay!
The two screws in the pill bottle have to have a small gap between them, this is where the ignition will take place. Wire the cappy bit to one end of the screws, and the wiry bit to the other. Clicking should generate a spark between the two screws, if not adjust the gap - around 5mm should do nicely.
You need a tiny amount of gas in the pill bottle to ignite. For small launchers, the best is to meter it precisely using a syringe, like so:

You need around 3-4% of the volume to be gas, this range is very important. Too much or too little means no ignition. For example, for a 100mL volume pill bottle, all you need is 4mL of butane, a 5mL syringe will therefore do nicely.
*clicky* BOOOM! yay!
