When you receive unwanted notifications from an app, touch & hold the notification, then tap Turn off notifications.
To review all apps and adjust whether they can send notifications:
Do one of the following:




If an app isn't sending notifications but you want it to:


Your phone can receive free alerts to inform you of public safety messages, threats to life and property (like extreme weather), and other emergencies.
When an emergency alert is sent out, 
You can turn most alerts off or on and adjust alert notification settings. Presidential alerts cannot be turned off.
If you've set a pattern, PIN or password, you can control which type of notifications show on your lock screen and prevent them from revealing private information.
To adjust notifications for all apps:
To hide sensitive content on your lock screen, turn Sensitive notifications off 
You’ll get lock screen notifications for an incoming email or chat, but they won’t include message details.
For finer control, leave this on 
To hide sensitive content from specific apps:

Types of notifications the app sends appear here. For each enabled notification that you want to hide: