Turn off the computer and unplug it
Open the case
Mount the Fractal AM4 bracket or cooler on the motherboard
Apply thermal paste if required
Connect the cooler fan cable to the CPU_FAN header on the motherboard
Connect any pump cable to the AIO_PUMP or CPU_OPT header if applicable
Connect any RGB cable to the appropriate RGB or ARGB header if applicable
Route and secure all cables
Close the case
Plug the computer back in
Power on the computer and check that the cooler is running properly