its a really findly job and a pain in the ars*. pop the bonnet and then on the inside where the lights are there is a screw cap, unscrew this and you have access to the lights. pull out the affacted light socket, the bulb pulls out and the new 1 slots in. make sure the contacts are touching. then replace it all.
Simon
January 2008
If its anything like my C Style Corsa its just a matter of finding the bulb thats affected, and there should be a twist cap for each bulb, bit of a git trying to get the barsteward thing back in though esp. if its on the passengers side as you have the fuse box and various other bits blocking your way. Best hint is that the holders have "top" marked on them for obvious reasons, and the rest is history
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.