As you may have noticed, or if you haven't, the Change Password command on the Special menu isn't functioning. We haven't yet fully installed and configured this software. This server is command-line driven, i.e. you don't use a mouse, you type commands with the keyboard. You need to log in, issue the command then logout.
Generalized steps are below.
Run the telnet program. When asked for a login, or on the same window where you enter the host, enter your email account name. Do not enter your full address just the first part. For instance mine is tgomez. If login is successful you will see a message scroll by.