hugh - 12:34 pm on Mar 12, 2010 (gmt 0)

Off the top of my head. Save the plugin to the /usr/src/.../plugin/ directory, sym link to it from /etc/munin/plugin/, edit the main conf file with the required details (user + group) and any other pre-requisites, reload munin before telneting to the munin port and listing Installed plugins. If that doesn't work search for troubleshooting on their website...