The first time you light the candle, allow it to burn until the liquid wax covers the entire top of the candle. This breaking in process insures that it will perform better and more evenly throughout the life of the candle.
Never leave a burning candle unattended. Keep wicks trimmed to 1/4 inch. If you notice a large flame during burning, blow out the candle & trim the wick before re-lighting. Place burning candle on heat resistant surface. Never move a candle while hot or burning. Blow out the candle if jar becomes excessively hot. Keep out of drafts. Keep out of reach of children.
To prevent candles from boring a hole down the middle, burn candles at a minimum of at least one hour for each inch in diameter. For example burn a 3 inch diameter candle for a minimum of at least 3 hours each time. Burn long enough to achieve a melt pool that can be seen all the way around the glass.