Stamp your image on tissue paper. Color it however you like. Cut out your image. Place the image on your candle. Wrap a piece of wax paper around your candle and image. Make sure your wax paper is long enough that you can have a handle to hold on to so you will not burn your fingers. While holding the wax paper snug against your candle, use your heat tool to heat the image until the tissue paper melts into the candle. Be careful not to heat too long or you will melt your candle. You will be able to tell when the tissue paper is melting because it will begin to look different. (Kind of like embossing powder looks different when it melts.) Slowly remove your wax paper and you are finished.
