The app is stuck on a screen after I subscribed.

This is usually a hiccup between the store and the app.

1. Force-quit the app and reopen it.
2. Make sure you're connected to the internet.
3. Update to the latest app version.
4. Stuck on the paywall after paying: tap Restore on the Paywall (bottom left corner of the screen). Web purchasers: check your email for the redemption link and tap it on your phone.