If it’s the front indicator globe that’s blown, you need to open the bonnet and work from inside the engine bay. The front indicator globe is held in a plastic component that forms part of the whole headlight assembly. The bit you need to find is right at the outer edge of the headlight assembly, right in the corner of the engine bay. Once you’ve located that (it will have wires coming out of it), a half clockwise twist will allow you to remove the plastic globe holder and change the globe. If it’s a rear globe, you need to open the hatchback, remove the screws that secure the tail-light assembly and then slide the tail-light free of the car. Turning it over, you’ll see the wiring and some plastic clips that fasten the globe-holder to the whole assembly. By unclipping this holder, you can remove it from the rest of the tail-light and reveal the globes which can then be removed and replaced.