Hi Jerry,
the best place to put CSS or scripts that should be applied globally is in the Global meta tags.
To do that you need to follow these steps:
1. Log in to the Core Administration
2. Navigate to Builder -> Content components -> Global meta tags
3. Click on the corresponding edit link of the last container Body Footer / Footer bottom
4. Paste you google code in the text area
5. Check in the checkbox under it, to enable the code placement
6. Click Save
If you want to confirm the success of the process, you can open any page in the Public site and review its source code. The piece of script that you pasted should appear at the bottom of the source code, right before the closing </body> tag