Firstly, burn your candle for 2-4 hours or until the wax melt pool reaches the sides of the jar at a time.
When done burning, extinguish the flame with a snuffer.
Before your next use, trim the wick to 5mm. This will help to control the size of the flame.
Don’t burn the candle all the way down. Stop burning your candle leaving around 0.5-1cm of soy wax in the container.