How can U melt candle wax already inside a jar to add another wick?

I have a candle that the wick has burnt down on. The sides of the jar however still have alot of wax that if I can get it melted and add another wick will give. … Aromatherapy Soy Candle Making Starter Kit $39.00. Overall Rating: List Price: $39.00.

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How can U melt candle wax already inside a jar to add another wick?