According to the documentation you are linking you should set graphiteHost in config:
graphiteHost: ip, hostname, ip: port, hostname: port or URL, the default port is http / https, the default path is "/ render". Any nonzero path (even "/" overrides the path)
The Bosun graphic page and line page only works with OpenTSDB as a backend. However, you can still use the expression page, toolbar, and configuration editor. When you use expressions that return seriesSet as a graphical query function , you will see a graph tab on the tab. You can also use the template functions .Graph and .GraphAll with graphite. Thus, it is largely functional.
There is also an example graphical warning in the examples part of the documentation.
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