Just found this! Try it on your device, this is for the X2.
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support.verizonwireless. ··· id=48998 1. From a home screen, select App menu (located in the lower right).
2. Select Emergency Alerts.
3. Select Menu.
Menu
4. Select Settings.
5. Select Receive alerts.
6. Select any of the following:
Note Enabled when a check mark is present.
Note Presidential-level alert cannot be disabled.
* Extreme alert
* Severe alert
* AMBER alert
7. Select Back.
Back
8. Select Alert reminder.
9. Select one of the following:
* Once
* Every 2 Minutes
* Every 15 Minutes
* Off (default)
10. Select Alert vibrate.
Note Enabled when a check mark is present.