Figure 11 shows the backplate for use with AMD and Intel processors, except for socket LGA2011 CPUs, with the nuts installed.
Install the backplate on the solder side of the motherboard, and then the four spacers on the component side. Then place the two metal bars shown in Figure 12, holding them with four thumbnuts.
The next step is a little tricky: you need to remove the cover from the cooler, put the heatsink over the CPU, and hold it in place with a third bar, fastening two screws at the first bars. But this bar and those screws are loose, and you need a very long Phillips screwdriver to fasten them, taking extra care so they do not fall from the holes.