How to do the McAfee/activate to protect the computer from harmful viruses?

Hello guys, hope you are doing great! I am here to take your help. Actually, someone suggests the McAfee antivirus software is the best one for protecting your computer system. I have also researched a lot and find the good reviews of this antivirus software. I decided to install this software but now I am facing the problem in mcafee.com/activate process. If anyone of you using this software and know-how to download and activate it, then please suggest me the steps. In addition to this, please refer me to the site where I should download it. Hope for your prompt response. I would be immensely grateful for your help. I also want that if you find any other antivirus software the best, then please share the name of that software and suggest the way how I can install it to my system.