I've got that, I didn't like it.
It's not actually a flint, it's a ferrocerium rod, and rather a tiny one. What you do is hit it with a sharpened piece of hard steel, such as a knife. Try it with the back of your knife first, no sense dulling your knife if you don't have to. But you'll probably have to use the sharpened side. Some people carry a piece of hacksaw blade for this purpose. You should see a spark when you strike it. When you know you can produce a spark reliably, get some dry tinder, kindling, and the rest of your fuel, and try to aim the spark at the tinder. When it catches a spark it will ignite, then you can add more tinder and then kindling, and fuel when appropriate.
It's much easier with a bigger ferrocerium rod, like the one on the edge of the magnesium firestarter you can also get from coghlans.
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Benton