Allow the candle to burn until the wax melts out to all the edges of the vessel. This may take from about 30 to 60 minutes.
The flame height may vary at times and occasionally appears to self-extinguish, but it's OK it will continue to heat and the flame height will return. Even if you are experiencing a 'low' flame.
Trimming the wick may help with lighting the flame. If you are experiencing any trouble use the tips of your fingers to just break of the black wood.
The recommended burn time is 3-4 hours.