Change head light on 97 mustang

The actual light? or just the bulb inside the light?... If you mean the whole light then pop the hood and look around the lens and you will a few screws that hold it in place. Remove and replace. If you mean the bulb, pop the hood and and look behind the light cover and you will see where the light bulb attachment screws into the back. Unscrew the attachment and remove the bulb. When you replace with the new bulb be careful to not touch the bulb with your bare hands as a chemical reaction will cause the bulb to burn out faster than normal. Put it all back together as it was before and you are good to go.