How do I change the headlight lamp on my 2005 chevy malibu classic?

Unplug the bulb from it's holder/connector.You will see there is a circular collar holding the bulb in place.Turn a quarter of a turn anti clockwise and it will detach from the headlight.Insert new bulb and do the reverse.Do NOT touch the glass with your fingers,because the oil on your fingers will cause a black spot on the bulb,which will make it blow.Use a paper towel.