[Mailman-Users] Setting Mailman Moderator Password

I maintain a website via Hostmonster that uses Mailman for an email group reflector. When I receive a moderation request I am taken to a page that says: If you have Mailman moderator access enter the list moderator password, or login via Hostmonster's Channel Webmail access (which I can do).

I would like to be able to save a step and enter the list moderator's password, but I don't know where to set it? Any help gratefully appreciated.