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The candles are ready to use. You don’t need to add anything to them. The short answer for how they work, is they work through spirit. You create the intention/desire. The herbs and oils, etc. create the “message”, I add power to them. You light them and your desires are heard and manifested.
Follow all safety guidelines for burning candles. Use your best judgement. You may light candle and put it out and relight. You will receive safety guidelines.
No, they are ready to use. You will get instructions with purchase. Not that you need to do anything extra, but simple best practices