Older students will recognize this as a type of Bunsen burner: it burns the gas coming from the tank at the bottom. To start the flow, turn the wheel counterclockwise twice (more gas flow than just turning once).
So what you would do is:
Click the icicle, take it, and drop it into the flask, which tilts over.
Click the wheel twice (any more and it goes the other way).
Click the matches and take one out, and strike it on the box.
Click on the base of the flask to ignite the burner.