The Honyaku mailing list is currently hosted by Google Groups, which has a straightforward web-based system for subscribing, unsubscribing, and managing your list preferences . I recommend doing it via the web, but you can do it the old-fashioned way by e-mail, too--see below.
Google Groups has its own FAQ for basic subscription mechanics at http://groups.google.com/support/
To subscribe to the Honyaku mailing list, send an e-mail message to:
honyaku-subscribe@googlegroups.com
This message must be from the address you want to use, but can contain any kind of message
When you are subscribed to the list, you can post your own messages for distribution to everyone else. Send your post to:
honyaku@googlegroups.com
You must send your post from the same e-mail address at which you subscribed to Honyaku.
To unsubscribe from the Honyaku mailing list, send an e-mail message to:
honyaku-unsubscribe@googlegroups.com
This message must be from the address you subscribed from, but can contain any kind of message
As near as I can tell, this is something that you must handle via the Google Groups website. You can choose to have mail delivery stopped (but can still read messages on the web), or have digest delivery.