This is from the manual.
1. Taking care not to damage the vehicle trim, lever out the lens unit.
Note: Always lever from the left hand side of the lens unit.
A picture shows arrows pointing to the little recessed areas on each side of the bulb housing, as the areas they are referencing to lever.
2. Twist, anticlockwise, and remove the bulb holder. Replace the defective bulb.
3. Install the bulb holder and clip the lens unit into its housing.