To run ads in your app made in AppsGeyser and get revenue from ad impressions while the application is used, it must necessarily be published on the Google Play Store.
How to do this is described in the step-by-step instructions in your AppsGeyser Dashboard.
Remember: it's just a guide, you won't have published your app clicking its steps, but will have learned how to publish!
Also in this video, you will find a detailed guide to registering the Google Play Developer account and publishing the app on the Google Play Store.
To activate monetization in the app after it was published on Google Play, you need to fill the required forms on the Monetize tab in your AppsGeyser Dashboard. Detailed instructions for setting up the ads in your app: AdMob and MoPub.