How to add Google Analytics Tracking Code to your site?
Fore more information: https://support.google.com/google-ads/answer/7548399?hl=en
Admin > Tracking Info > Tracking Code.
Copy the Global Site Tag:
Login into your site Admin
Visit Admin > Layout. Click to open Head Tag
Copy and paste the Global Site Tag code as the first item into the of the Head Tag section. This will be added to every webpage on your site.
Click Update to save and finish.