As long as this plugin is not a standard Maven plugin, it must be installed manually. This is very easy.
If you have a binary distribution of the plugin, just copy the plugin jar file
to your $MAVEN_HOME/plugins directory. and the simian
jar file to $MAVEN_HOME/repository/simian/jars.
If you have a source distribution of the plugin, installing the plugin is just as easy. Just run
maven plugin:install
from the root directory of the unpacked distribution.
To enable the plugin add the following to your project.xml's /project/reports node:
<report>maven-simian-plugin</report>
For further details about how to use the plugin, see the Goals and Properties pages.