Open the hood, remove the rubber cover for the high beam bulb (inboard bulb, closer to the radiator), remove high beam bulb and next to it inside the light assembly is the position light bulb. Using a pair of long and 45degree needle nose pliers gently grab the position light bulb socket and pull it straight out! Do not pull on wires and I had to remove my air filter box cover to get my big hands behind the light assembly! Bulb is a W5W, buy it before starting this job!
the position light bulb is located towards the inside of the headlamp. Its the small "peanut" type bulb. You can access it by removing the high beam bulb and some needle nose plyiers should do the trick.
The left front position is the outside hitter. The middle front position is the middle hitter. The right front position is the setter.
Left or right hand side?
The front right, front middle, front left, back left, back middle, back right
The front impact sensors are mounted behind the fog lights. If you do not have fog lights, just look through the fog light position in the front bumper.
Under the front of the right front head.
Secret flap in wheel arch under the mud and stuff.
the socket should just turn out in the back under the hood.
In the engine compartment right on the back side of the corner light there is a ring with a spring that hooks to a tab. Unhook the ring and the corner light slides out
A light ray is always at right angles to its wave front.
setter or offside/rightside hitter
assuming you mean the light bulbs, see the answer to "how do you change turn signal lamps both front and rear on a 96 mercury grand marquis" right here in WikiAnswers.