[Mailman-Users] how to change http url

[Kevin Carlyle]

My list software works great for sending and receiving emails.

However, 
I was just sent an administrative approval email.  It works as it should in
this case so no issue
but
the url was http://192.168.1.8/mailman... when I'm not on the same network
as the server.  Thus, I can't use that url.

All pages use the IP address, the administrative email uses the ip address

I need to change the IP to the domain mailman-wide.

Reinstalling is not an option.

How do I do this?

Kevin