Light the candle representing yourself and say:
"This is me (name or magickal name), everything that I am."
Light the black candle and say:
"This is my bad luck. Leave me now, you're not welcome here anymore. I shed no tears over the parting."
Light the gray one and say:
"This one neutralizes any remnants of bad luck. They dissolve into nothingness now."
Light the orange one and say:
"This one represents the changes for good which are coming into my life. I welcome them with open arms."
Light the magenta candle and say:
"This is the astral energy that I need to speed up the change."
Now sit for several minutes chanting
"I welcome change. I welcome the incoming good into my life."
The candles must be allow to burn completely...