Using the jack from the tool kit, handbrake on.
Raise the vehicle to the stage where the wheel is about to leave the floor (ideally place an axle stang under for safety)
There should be a flap in the front corner on the underside of the vehicle - pop the flap down and look in it is self explanetry to change.
If its the lamp unit your going to need to pop the front grill out - it just clips out quite easily ( mine got knicked off my cl600 recentley) and it just bolts out and in
Whenever changing any parts always look at the new unit to see where the mounts and srews are etc.