Add "MonitorServer = 127.0.0.1" to your configuration file. Add "MonitorRequests = yes" only to virtual hosts which are important enough to monitor closely, because this option produces a lot of log information. Restart Hiawatha.
Go to the Webservers CMS page in the Monitor Website. Add the machine you want to monitor (which is 127.0.0.1)
Request some websites of your own webserver and wait a few hours. Log information will appear in your Monitor Website. Restart Hiawatha to force flushing of log information if you can't wait that long