Lift off the rubber strip by pressing it inward in the engine compartment.
Press down the pins into the plastic cover's four clips using a screwdriver or similar and lift away the cover.
Refit the cover in reverse order.
Removing the plastic cover for bulb replacement
The bulb in the halogen headlamp can be replaced without the help of a workshop, but the plastic cover over the headlamp must be removed before a bulb can be replaced.