You can update your non-emergency phone numbers by click on this link:
https://my.frontpointsecurity.com/account/settings
Or to access from the home screen of MyFrontpoint.com:
Click on My Account on the left menu.
Click on the pencil icon next to Account Info. Here you can edit both the Primary and Secondary phone numbers
Click Save when you are done.
Note: This section of the website will only appear if you are logged in using the primary login for your account. Any secondary logins you have created will not have access to this page.