Log into the Customer Administration Portal at vip.anpi.com
In the menu on the left, click on Location
Scroll down and click on All locations or select the location menu item
Click on the Manage Phone System tab
Locate the user with the search box in the upper right-hand corner of the Locations window
Once the user is located, in the Action column, click the green Reassign button
From the drop-down menu, select the new user.