As an iPhone user, you can easily manage notifications by following these steps:

1. Open the "Settings" app on your iPhone.

2. Scroll down and tap on "Notifications."

3. Here, you'll see a list of all the apps installed on your device. Tap on the specific app for which you want to override the notifications.

4. Inside the app's notification settings, you can customize how notifications appear. To turn off notifications completely, toggle off the "Allow Notifications" option. This will prevent the app from sending any notifications to your device.

5. If you want to receive notifications but in a less intrusive manner, you can customize the notification style, sounds, badges, and more according to your preferences.

Here’s a quick video to show on How to Set up the App Notifications on Your iPhone.

For Android users, the steps may vary slightly depending on the device manufacturer and Android version. Here's a general guide:

1. Open the "Settings" app on your Android phone.

2. Look for and tap on "Apps & notifications" or "Apps" (the name may differ depending on your device).

3. You'll see a list of all the installed apps. Select the app you want to manage notifications for.

4. Inside the app's settings, you may find a "Notifications" section. Tap on it.

5. Here, you can customize the notification settings for the app. To turn off notifications, toggle off the corresponding switch or select "Block all" notifications.

Here’s a quick video to show on How to Set up the App Notifications on Your Android Phone.

Keep in mind that these steps may differ slightly based on your specific device and software version. However, the general process should be similar for most iPhone and Android users.