Where to place the app ID for admob?

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I have been trying to add app id but I could not find any place for it. It made an app which only contains an ad and a for testing but the app stops when I try to open it.
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If you want to make a app which has admob ads in it you have to put the appId in the Screen1 designer properties section, Also have the Use the MobileAds component to make it work

See this Post: How to Use Admob Ads| Guide