This tutorial will show you how to insert your tracking code obtained from Google Analytics to a page. If you want it to be inserted on all pages, insert it to a template page instead. Then any pages that use the template page will get the tracking code.
Open a website and open a template page such as "template.html". If you want to add it to a particular page only, open that page.
Right-click on the blank area of the page and select "Page HTML" from the context menu. Then, click on the "Inside Head (Bottom)" tab.
Paste the tracking code from Google Analytics to the text field and click on the OK button to save it.