Keep the wick trimmed to 6mm to ensure even burning and ensure your first burn is long enough to create an even pool of wax along to surface of the candle - we recommend 4 hours.  This will avoid the candle from tunneling.  Ensure candle is free of any foreign or flammable materials including matches and wick trimmings before burning.  Keep wax pool free of debris.  Do not touch or move candle when it is burning/hot.  Store candle in a cool dry place below 25 degrees celsius and keep away from direct sunlight.  Stop burning when 2cm of wax remains at the bottom of the jar.  This will prevent possible heat damage to the counter/surface or container itself.  Please note that the glass candle container will get hot on the bottom as the flame nears the base of the jar and most of the wax has been consumed.