Google Tag Manager (GTM) is an extremely powerful tag management system that allows you to add and update website tags without having to touch your site or mess with code!
Once you've integrated your GTM account with your FMG website, you can log into your GTM account to add and update tags such as Google Analytics, Google AdWords, and other page-level and site-wide tracking pixels.
Integrate Your Google Tag Manager Account
Add your GTM tracking ID to your FMG Dashboard to complete the integration.
Copy your Container ID in your Google Tag Manager account.
In your FMG admin, go to Website >> SEO.
You will see the Google Tag Manager section on the right side of the page. Paste your Container ID, and click Publish.
Note: This change will not generate a compliance case and will go live immediately.