Remove the crystals before lighting the candle.
The first burn is called a memory burn. Light the candle for 3 hours or once candle has burnt to the sides. This will ensure an even burn in the future.
Trim the wick before relighting. It is important for the wick to be short (0.3cm to 0.5 cm is recommended).
If the melted wax pool is deeper than 1cm, please extinguish candle.