To use the Megazone mailing list just send mail to megazone@lists.lancs.ac.uk, and your message will be sent to all of the people on the list. You can mail to the list owner (currently me) by mailing to owner-megazone@lists.lancs.ac.uk.
The list is run using majordomo, so you can send commands to majordomo@lists.lancs.ac.uk to get information about the list. The list name is 'megazone', so for example mailing the single line message 'info megazone' will cause majordomo to mail you back the list information file, or 'who megazone' will tell you who is subscribed to the list.