Hi,
You are in the editor mode. There are 3 diff ways you can make the app "work":
1. Save the app and then from the list of apps on web.powerapps.com click on this app to "play" this app (when you click on Next, it will take you the next training module)
2. From within the editor, you can click |> on the play icon on the top right section. This will run the app in preview mode
E. From within the editor, press the ALT key and simultaneously click on the Next button. This will also take you to the next module.
Let me know if it lets you move forward with any of the above mentioned ways.
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Hardit(Haman)