[expert] netscape mail username

[S. Newhouse]

Hello, 
 I keep getting the following error message from Netscape 4.7. 

  Netscape is unable to use the mail server because you have not
  provided a username.  Please provide one in the preferences and try
  again. 

I keep trying to fill in the forms in the preferences, but to no
avail.

Anyone know what to put where?

TIA,
 -sen