Your password can be changed from the CCC at avvantamail.com from the Tools menu.
Password changes can take up to 15 minutes to completely propagate through the Avvanta network for all services.
When changing your password, keep in mind that it changes the password for all services associated with that account. If you are running a Century Link DSL line using a Cisco, Best Data or ActionTec router, don't forget to update the password there as well. Most other application software will prompt you to re-enter your password after you have changed it.