This documentation will help you according to your problem. https://developers.google.com/admob/android/quick-start
You should add this code to your manifest.xml
file.
<application
...>
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-3940256099942544~3347511713"/>
</application>
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