Feathr GTM

Feathr uses Google Tag Manager (GTM) to track traffic.
https://tagmanager.google.com/#/home
The container is owned by woccu.marketing@gmail.com so you need the login details for it. Non-owners can't publish.

A button is visible if you can publish/if updates are available, in the top right corner. If you aren't in the correct account, it won't tell you.

If there are updates to make, hit submit, and continue. It's pretty self-explanatory.