Help can't install Hyper 212 evo backplate

yep.

Careful with the graphics card as there MAY be a retention latch that needs to be pulled out on as you remove the card (forcing can damage the latch)

There should be six screws for microATX and nine screws for ATX motherboards that go through the motherboard into the standoffs that are screwed into the back of the case.

Other:
if the motherboard support site has FAN SOFTWARE use that to setup a custom fan profile