Adding Google Tag Manager to your page is done in three easy steps.
1. Grab the container ID from GTM, i.e. GTM-XXXXX;
2. Click the name of the landing page, then click on Integrations, then on Marketing Tags & Pixels, then click on Google Tag Manager.
3. Enter the GTM ID in the designated field.
Double-check the ID so that no extra spaces or symbols are added before or after it in the designated field.
4. Hit Save and then go back to the main slideout to Update the page. Clicking on Update Experience is mandatory in order for the changes to go live on the URL of the page.