[Mailman-Users] Welcome message

[PeteBell]

Hi

I saw a reply to a query recently about editing the "welcome" message 
for a list.

My question is twofold:

I don't have access to the installation of Mailman, as it is shared. 
However, my host has been good at making certain files available to me 
on request. So...

(a) Which file is the correct one and how do I go about editing the 
file? Is it Python, a particular component of Python, or a text 
application, and how do I go about saving it back again into the 
correct format? (I have never used Python yet, so please be explicit 
and easy-to-follow)!

(b) Are there any other admin-editable notification emails which can be 
done in the same way?

Thanks in advance
PeteBell, UK