[Mailman-Users] Welcome message

[Jim Swift]

Sorry to be asking this a third time, but I am sure someone here knows
the answer. If not, does anyone know  where can I find the answer. 

My ISP is running Mailman as part of Cpanel and neither of us can find
the location of the text of the basic welcome message to modify it.
There does not seem to be any Site Admin password or access that we
can find in the Cpanel screen. 

How can I modify the part of the welcome message that is common to all
lists? 

jswift