CComment docs
Ninjamonials – com_ninjamonials (Pro feature)
First you need to download the plugin “compojoomCommentNinjamonials” from the download section at Compojoom. Then install it and enable it just as a normal Joomla plugin. After that go to components->CompojoomComment->settings click on new and from the component dropdown select com_ninjamonials, click save and now in frontend you should see the comment form in ninjamonials entries.