gi04,
Have you loaded the plugin in Maya? I mean have you gone to the Plugin Manager?
Go to Window>Settings/Preferences>Plugin Manager. Here find the plugin, and load it, You can also set it to auto-load so that it will be ready for use when Maya starts again. That should help you out.
John 'Zimm' Zimmermann
Setup Artist
https://johnzimmermann.com
“Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world." - A. Einstein