As a Page Manager, you add this code to your site: 

If you want it to apply to the whole site, enter this in Site Settings.
  1. Navigate to School Website.
  2. Select Website > your site.
  3. Click Site Settings.
  4. Scroll down under SEO to the Google Analytics field, and enter the code that should be in the <header> section here (below your existing GA code if you have one).
  5. Changes save automatically, and this will now apply the code to your whole site.
  6. The code that should be in the body section should be added to an embed widget on each master layout.
Note: Google states that some code needs to be included on EVERY page, just after the <body> tag. This is what step 5 is implying it will automatically do