Pull plug off the bulb terminals , remove rubber cover, there is a spring clip hinged at 1 side, release it and the bulb is now able to be removed. Fitting is in reverse. I found that if the bulb is not seated all the way in, I fabricated a metal spacer abont 2mm thick (not plastic, it will melt, gluing your bulb in) to achieve this, this moves the filament further back in the headlight and seams to give a better spread of light on the road or shorter bulb also does this.