If your concern is regarding linking the AppStore/PlayStore apps to your AdMob account, I'd suggest that you take a look at
this guide which explains in detail about this. If your app is not published yet, you will not be able to find these apps through the account dashboard. You will have to add them manually. If the apps are released, then it might take one week for the app to appear in the list and link it. Let me know if you have any other questions.