You need to remove the whole headlamp assembly, it's held in by 3 bolts, remove the bolts and pull the whole assembly FORWARD - some effort is required as the assembly is also held in place by a plastic clip on the bottom of the assembly, (be careful not to rip out the wiring as it comes free) the assembly will now come far enough forward for you to access the side light holder under the access covers the bulb holder is a straight push fit - you may well need long nose pliers to pull it out as the access covers only allow the smallest of fingers inside.
Anybody thinking this bad design by Kia is correct.
Grease Monkey, March 2011