Universal Analytics has been replaced by Google Analytics 4

This feature requires a paid subscription.

First go to "My Publications"
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and then go to the settings of the magazine:

Scroll to "Analytics" and add the Analytics Property Code to the magazine (for example "G-XXXXXXX") and hit "Save". You can use a newly created property code or one of an existing magazine. In the second case, the statistics will be counted on one of the websites. You can also use one code for multiple magazines.
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Yumpu magazines support tracking is only possible with the new Google Analytics 4 codes. We used to support the old Google Analytics codes, but this is no longer possible.

If you need more information on how to generate the Google Tracking code please refer to the documentation and FAQ's of Google: https://support.google.com/analytics/?hl=en#topic=3544906