To change your notification settings on your Amazon Fire device, simply follow these steps (may vary depending on device model):
- Swipe down from the top of the screen
 - Tap "More" > Applications > "Notification Settings"
 - Turn notifications on/off for your app
 
 or  
- Swipe down from the top of the screen
 - Tap "Settings" > "Notifications & Quiet Time"
 - Tap on the application you want to manage
 - Turn notifications on/off