THIS is how you light the torch.

Just touch the torch tip on the "switch" and sparks fly inside the little"cave"

I've had this for 15+ years and have only had to replace the batteries a few times.

 

Sometimes you get a carbon build up in the cave and it needs to be scraped and cleaned so the current has a ground to go to. A small steel or bronze plumbers brush might be able to get in there?

Done