To begin removing the H4 headlight bulb you need to find the electrical connection at the back of the headlamp bulb.
Once you find the connection you will need to pinch it to make it possible to remove the bulb
There is a rubber cover on the bulb that serves to protect it. This cover should be removed.
The wire that keeps the bulb in position will be held in position on one side by a screw
On the side that does not have a screw you can press the wire inwards and upwards to make it pivot away from the headlamp bulb so the bulb can be easily pulled free