Up behind the helmet lock on the right hand side of the rear subframe. It usually comes without a bleed nipple and has an allen headed plug instead. Get your dealer to fit a bleed nipple when it is serviced or buy one from Motorworks and fit it yourself. Easy peasy.
I always wondered what that was for,now I know,it's off to hosequip now to order my new nipple so I can change my clutch fluid,the nipples are a fine thread and had to be a special order for my front calipers,can't remember but I had change out of £1.50 for 2.cheers Andy