Hi
I haven't yet done this on my 2006 Mondeo, but this should help...
1. Remove the front grille by twisting the small plastic retainers in each top corner and unsnapping the grille from the body work. Be careful as the plastic will break if you use too much force.
2. On each headlamp, look for the retainers (two 4-inch long vertical strips of metal with about the top bit bent over into a right-angle facing the front of the car). Pull these upwards and out, and then lift the headlamp clear of the car. They might be a bit stiff, so WD40 at the ready!
3. Remove the screws that hold the xenon bulb and its electronic module in the headlamp, and remove the unit from the headlamp. Move the headlamp unit clear of the car.
4. Inside the headlamp is a silver colour lever. Move this lever to the opposite position to which you find it in. (I have heard that the lever should be moved to the "up" position, but clearly this can't be done if the lever is already in the "up" position!)
5. Follow this in reverse to reassemble the unit.
6. Repeat for the other headlamp
7. Test after adjustment to ensure that the operation has been successful
It's good to know how to do this in any case as you could be asked by the French Police to change a defective bulb at the roadside, and risk a fine if you can't!
Bonnes vacances!
Baldbloke, August 2007