Google Tag Manager (GTM) is a free tool offered by Google, that makes it easy for marketers to add and update website tags -- including conversion tracking, site analytics, remarketing, and more—with just a few clicks, and without needing to edit your website code.
Here is the guide to enable GTM at your SHOPCADA Site.
Go to Manage Your Store (Dashboard) > Setting> SEO & Tracking > Tracking
This is the section for you to manage the tracking setup.
Under Google Tag Manager, enter your GTM Container ID.