Do you mean Google Analytics, or Google Webmasters Tools?
I can’t see anywhere that Analytics asks to authenticate the domain, but I know that Webmasters Tools does.
If you do mean Webmasters tools, the I know that Google supplies you with a <meta> tag to place inside the <head> tag of your home page. There are plugins that will do this for you. But it doesn’t always w2ork.
Google provide an alternative method of authenticating your website, which is to download a file with your Webmasters Tool code in the file name. This should be uploaded to the root director of your website using FTP of the file manager in your CPanel. It should now authenticate instantly.
