If you need to update your MFA verification method or phone number you can easily do so by going to http://mfasetup.nova.edu.
Please be aware that once you have registered for multi-factor, you need to multi-factor to access this site and change your settings. For example, if you chose to use the Authenticator app, you will receive an MFA prompt through the app that you will need to approve in order to proceed.
After logging in choose either to
1) Change the phone number to the new number and choose the method to Authorize
2) Choose a new method of Authentication and enter the new Phone number
Finally choose the default sign in method (of the bellow methods)