Hello. My name is***** to JustAnswer. I'm reviewing your question now, and will post back with your reply momentarily.
In order to help you, I need to know what operating system you have on your device. Windows Vista, Windows 7, 8.1, 10, or do you have a Mac?
Did you order this online or from a CD?
If you purchased it as opposed to a free trial, you will need to follow these steps: (you should have an email giving activation code)
Or, do you already have a free version and want to 'enable it' ?
Please give more information about what you purchased, downloaded, steps you took to get mcafee etc?