Official Answer
Google Tag Manager is a powerful tool to help you configure and deploy tags on your Gadsden website theme.
Gadsden has Google Tag Manager’s scripts pre-installed — you only need to tell us your container ID, formatted as “GTM-XXXXXX.”
Adding your Google Tag Manager container ID to your Gadsden website theme
To add your “container ID” to your Livingston website theme, navigate within your NationBuilder control panel to your website’s homepage.
There, add a tag `ts_gtm_id: GTM-XXXXXX` where GTM-XXXXXX is replaced with your own container ID.
Finally, save your changes. Your Google Tag Manager container will now be active on your website.
Learn more about Google Tag Manager
To learn more about Google Tag Manager, watch the video below and read their support documentation.