It should be talking about the URL for your webapp I believe. Not the test version, the actual url. It just basically shows whatever url you put there. For example, www.google.com would show google in the app.
Here are a few ways to find the link to your mobile app:
Check your app store: If you’ve published your app on the Apple App Store or Google Play Store, you can search for it using the app’s name or your developer account.
Look in your email: The app stores will usually send you an email with a link to your app after it’s approved and published.
Visit your app’s website: If you have a website for your app, the link to download it should be prominently displayed there.
Use a QR code: You can create a QR code that links directly to your app’s store listing.
Share the link on social media: Promote your app by sharing the link on your social media profiles.