Visit https://tagmanager.google.com/
Log in as an admin.
Follow the steps below:
If you don’t have Google Tag Manager set up, follow the instructions to set up a new account and then follow the steps above.
Using Google Tag Manager allows you to replace hard coded “tags” with code from the Google Tag Manager code and you are able to set tags, triggers and variables to define what third-party scripts run, on which pages and under which conditions.
Your developers should be able to set this up in a short amount of time