Click here for a list of all the lamps on a Roadster.
These are not as awkward as the side lights but the offside one is still slightly tricky with the washer bottle where it is.
Remove the bonnet bin and reach down to the back of the lower light clusters. If you have fog lights, you will feel a rubber cap first. You need to feel above this to get to the indicators. The lamp is a chunky twist fit holder which you should be able to access without the need for any tool.
Replace the lamp and refit the holder.