Offline installation and setting Tikione Netbean Plugin

I try to install Tikione JaCoCo Netbean plugin with *.nbm files download to :

http://ift.tt/23HN7dH

I have restarted my netbean but i can't see code coverage options in my netbean menu. I work on a java project using maven.

Could you explain me how setup this plugin with an existing project using maven build tool ?