CComment docs
AdsManager – com_adsmanager (Pro feature)
Go to your joomla backend ->components->CComment-> settings ->click new -> from the component dropdown select com_adsmanager and click next. Save your configuration. You should see a comment form after your ads now.
Now go to the Plugin Manager (Extensions -> Plugin manger) -> find the Adsmanager - CComment plugin and enable it. In the frontend under your ads you should see a comment form.