You have the depressed ring around the outside of chimney part, right?

Pour a little fuel in there, that will burn openly and heat it enough get fuel running up through to the jets, and then it lights from there. Sometimes I have warm the entire thing though, as I pointed out with the tuna can stand- just drop in a cotton ball, light it, and when it abot half burned, drop the bottom of the trangia in there. Give it a minute before fueling and priming.

And if won't light, and you need it right now, just toss a match into the main cavity. Won't be as efficient, but you'll be able to at least water.