2004 BMW R1200C How do you I add brake fluid to the clutch reservoir--- I unscrew the lid then do I simply pour the fluid on top of the bladder OR do I add fluid under the bladder?

Fluid goes under the bladder. The bladder is there to isolate the fluid from air, since it's air that causes degradation in the fluid. Also, make sure just what type of fluid the manual calls for, since some systems use mineral oil-based fluids (brake fluid is glycol based). Also, the fluid type may be called out on the reservoir cap itself.