Okay....the gold things that are in the first picture that borat posted are motherboard standoffs, and they screw to the case then you mount the motherboard on top of them. You have to use them, if your case came with them, thats fine, use those ones.
How they work is they screw into the holes in the case. Then you put the motherboard on top of them, lining up the holes and you use the motherboard screws to screw the motherboard down to the standoffs.