The answer is simple.
However, to do this, the focal point of the lens (of the magnifying glass) has to be at the right spot, like the image below. Just make sure that to hold the magnifying glass at the correct distance, so that there will be a huge amount of light going to the tip of the matchstick. The correct distance is when the bright dot is really small and where you can see a full circle on the matchstick.
