First you will need your Google Analytics account number. You can find this code by logging into your Google Analytics account. The interface on Google Analytics changes frequently but you should be able to locate the number on the page where you find your tracking ID and tracking code snippet and copy the UA number (UA-xxxxxxxx-x) from that page.
Once you've got the UA number, navigate to your admin console and add the account number to the Setting: Google.AnalyticsAccount.
Lastly, make sure that the Setting: UseLiveTansactions is set to Yes. This setting assures that Google Analytics only runs on your live website.
At this point you have completed the installation of Google Analytics. You should be able to view page source on the front end of your website and see the Google Analytics code.