Flip the top metal load plate down so its tab engages with the metal retaining screw in the motherboard.

To lock the CPU in place, rotate the metal cam lever arm down towards the closed position. The top metal load plate tab has to slip under the metal retaining screw or the socket won't close properly.

Secure the metal lever under the retention catch. The LGA1156 processor is now correctly installed in its socket and ready for the next step, which is to mount the heatsink.

At this point it's a good idea to install the motherboard into the computer case if you haven't already. If you need any help on this topic, see this PCSTATS guide on the subject. Now it's time to install the heatsink, this isn't complicated but can be a little tricky in the confines of a dark computer case.