To change the settings in a particular COS, use a laptop to log in via an ethernet crossover cable. Change your laptop's ip to 192.168.110.11 255.255.255.0, gateway 192.168.110.10 255.255.255.0 (this is default- if the CP's ip has been changed, you'll have to call the vendor.)
Using a web browser, navigate to 192.168.110.10. You'll be prompted for a password- the last 4 digits of your f983 password.
Go to mailboxes, and cos. Change what you need.