Now that Mailman is all set up, there are a few site-wide configurations you can make before you start creating mailing lists. You should do these steps using the account you installed Mailman under in the 13 section.
The install process will never overwrite an existing mm_cfg.py file so you can freely make changes to this file.
% $prefix/bin/mmsitepass <your-site-password>
This password can be used anywhere that individual user or mailing list administrator passwords are required, giving the mailman site administrator the ability to adjust these things when necessary.
You may also want to create a password for the site-wide ``list creator'' role. The list creator is someone other than the site administrator who has privileges to create and remove lists through the web interface. Use the -c option to mmsitepass to set this.