the plug circled is a picture of the extra plug for the cc buttons, as you can see it sits just on top of the indicator stalk wiring so is easily found. sorry the pic aint the best, i took it with my phone lol.
remove the top and bottom cowling then there is 2 plastic bits (1 top and 1 bottom) that you need to press in then the indicator stalk should slide out then you can unplug it and replace with the new one and connect up the cc buttons.