Have a look at the below instruction and you will know how to install a CPU cooler. It is not difficult. Here is a simple procedure if you want to install it by yourself.
Insert CPU in the socket. But you must ensure that this connection is very tight. No loose anywhere.Cleaning your CPU and the heat sink surface.Use the thermal paste to apply on the heat sink surface.Continue applying thermal interface material, such as silver-based or ceramic on the surface.The next step is to mount your CPU cooler on the head sink socket. Check carefully to ensure that your CPU cooler is latched tightly on a socket.Wipe off thermal paste and CPU cooler.
Yes, you have finished the installation for a CPU cooler.