Take your fan out of its packaging and take note of the polarity of the wires, check the second photo for a diagram.

Using a TORX TR10 bit and the scews you just took out screw the fan back in. Make sure of its orientation, id recommend having it as exhaust (like in the photo) so it sucks air in through the heatsink. Putting it as intake might not work as well, i would just follow how the manufacturer did it.