How do I manage notifications on Android?

To manage the notifications in any Android device (tablet or phone), just follow these steps:

(Note: Instructions may vary slightly depending on your device or software version.)

Go to "Settings"
Go to "Apps" or "Application Manager"
Tap on the "Manage apps"
Tap or search for the application you want to manage.
Select "Notifications", and then activate/deactivate the checkbox for "Show Notifications"