1. From the Home screen, tap the Apps icon.
2. Tap Messaging.
3. Tap the Menu icon (three dots at the top right).
4. Tap Settings > emergency alerts.
5. Tap the Menu icon (three dots at the top right) then settings.
6. Tap to check or clear the following options: Extreme Threats Alerts. Severe Threats Alerts. AMBER Alerts.
You can also turn vibration on or off and alert reminder sounds on or off.