Charging a candle imbues it with your intention; the candle can then be used with any spell for enhanced results. While picturing what you want to achieve, anoint the candle with the scented oil of your choice. My favorite oil is “vamber,” which is a combination of vanilla and amber. Remember that your level of clarity and concentration will be reflected in the candle’s power.
You can further charge the candle by scratching your desire into the wax. I use the thorn of a rose for this, and you can write words, although many witches use symbols—a heart, a dollar sign, or a number, for example.