Detach the headlamp.
Remove the small round cover.
Pull the bulb holder in order to extract the bulb.
Remove the blown bulb and fit a new one. It can only be installed in one way.
Fit the bulb holder in the socket and press until a clicking sound is heard.
Refit the cover. It must be fitted and pressed in until a clicking sound is heard.
Reinstall the parts in reverse order.