the instructions should help you more then i can, im guessing you need the secure the 4 black pins through the bracket onto the motherboard, then screw the cooler onto the bracket with two screws
i really cant help you any more as i havnt had the cooler before but it should be pretty self explanatory if you do it step by step
EDIT do the white pins have a slot in them for the black pins?
because im guessing, you have to place the bracket on the motherboard then drop all 4 white pins in upsidedown, then slot the black pins through the white ones too spread the pins too secure it too the motherboard