Google analytics will provide you with code to copy into your web site. Follow the steps below to add Google Analytics to your site.

Copy the code provided by Google.
Login to your Administration Console.
Click EDIT PERMANENT PAGES
Select HOME PAGE from the drop down list.
You should now see the editing interface. At the bottom of the editor, click the tab that says HTML.
Now scroll the content (in your editor) all the way to the bottom.
Click after the last character. Press ENTER about 3 times.
Right-click and select PASTE.
Click the SAVE button at the bottom of the page.

Congratulations, you have just added Google Analytics to your web site.