Starting to use functionalities like Google Analytics, Google Tag Manager or Facebook Pixel usually requires that a small script (piece of code) has to be added to your website's header or footer section. You can do this yourself, by using plugin such as Insert Headers and Footers.
Go to Plugins-section in WP-admin
Install and activate Insert Headers and Footers plugin
Go to Code Snippets -> Header & Footer
Add your code snippet in the right place and save changes.
