Follow these steps to add tags, analytics or trackers to your account:
Go to Dashboard and click the Tags and Analytics option.
For Brand Stories you can add the Google Analytics code on field at the top of the page. If you use a custom domain you can add other tags and tracking codes belonging to the <head> or <body> sections (HTML).
To automatically insert ads inside your stories you can paste the code inside the Ad tag field. Ad tags should only be added to this field and not <head> or </body>.
Please note that these tags and analytics will be automatically applied to all stories in your account.
For Web Stories you can add the AMP analytics on the field at the bottom of the page. It needs to have the proper config as per Google AMP documentation, please see articles below: