From the home screen of the Frontpoint App:
Tap the Menu button
Tap Login Information
Tap on _Password
Type in the old password as well as the new password in the boxes
If you have forgotten your Password, click Here
If you have forgotten your User Name, click Here
If you have lost a phone or suspect someone may have access to your account, you can force a logout of all devices that are already logged in by checking the box marked Log out all devices.