The candle is lit outside of the jar and is then lowered into place.
Step 1: The Candle Holding Wire
It is bent in such a way that three parallel sections of the wire dig channels into the candle when it is pressed in place. That holds the candle firmly.
I bend the hook at top a little tight to grab the jar lip securely, instead of letting the candle dangle loosely. The object is to hold the candle in the center of the jar and not let it flop against the jar wall.