Editing How to Add an App to Notification Center in iOS

To add an app to Notification Center in iOS, follow these steps:

1. Open the "Settings" app on your iPhone or iPad.
2. Scroll down and tap on "Notifications".
3. Scroll down and find the app you want to add to Notification Center.
4. Tap on the app.
5. Toggle on the "Allow Notifications" switch if it's not already on.
6. Scroll down and tap on "Notification Center".
7. Toggle on the "Show in Notification Center" switch.
8. Choose how you want the app's notifications to be displayed in Notification Center by selecting either "Notification Center" or "Banners".
9. Customize any other notification settings you want for that app, such as sound, badge app icon, and whether or not to show on Lock Screen.

Once you've completed these steps, the app will be added to Notification Center and its notifications will be displayed according to the settings you've chosen.