If you want a comprehensive tutorial you should write a comprehensive and clear question.
If you mean stats.ny, please see this topic: "Wave Stats" plug-in NY files should be placed in the Plug-Ins folder in your Audacity installation folder, then restart Audacity.
Audacity 2.0 is now old, please update to latest 2.0.5 from Audacity ® | Downloads .
Gale