How do I install McAFee antivirus on my PC?

I am using a high costly laptop for my official tasks. I am communicating with my all customers with the help of laptop. My laptop is very advanced and efficient, so I am fully working on my laptop for communication purposes. To protect my laptop and important information, I want to install McAFee antivirus software on my computer system. I don’t have complete technical knowledge to install MacFee antivirus software on my PC. I want to install McAfee antivirus software using mcafee.com/activate. I have opened this link in my preferred browser and have entered the code in the displaying box. Now, I am getting stuck to complete next step. So anyone can suggest the easy tips to install McAFee antivirus on my PC.