Right-click the McAfee icon near your system clock snd select 'Verify Subscription'.
If you are already registered it will say so, if not it will ask you to create an account, or.....
Go to https://home.mcafee.com/secure/protected/login.aspx? and alter your Country/Language at the top if necessary (click image to enlarge)
Log in or create an account or click the 'Forgot.....' links below the log in space.
You can also phone Customer Service free of charge and they will check the account for you.
See the link under 'Useful Links' at the top of this page.