Ignite one fuel cell by placing it in the stove and lifting a portion of the pleated wrapping. Then use a match to light the paper.
Alternatively, you can light a fuel cell without the wrapper by pinching off a small piece of the fuel cell and crumbling it on top while the fuel cell is in the stove. Then use a match to light crumbled pieces.
The flame can be extinguished at any time by removing the cooking ring and placing the lid back on the stove.