Set up Facebook comment moderation for your site to enable you to edit or delete comments that are posted on the sites you build.
To use the comments moderation tool, you need to complete the moderation setup instructions.
NOTE
You cannot use the Graph API to reply to comments made via the Comments Plugin.
There are two ways to navigate to the moderation tool:
App-based moderation view: Go to developers.facebook.com/tools/comments. You will get a list of all your Facebook apps, which lets you moderate all comments associated with each app. If you don't use a Facebook app with your comments plugin, you won't be able to use this view.
Page-based moderation view: Click the Moderation Tool link next to the comments box (see screenshot below). The view only shows comments posted to this webpage (URL).
For more details and complete instructions on enabling Facebook Comment Moderation, see the Facebook for Developers Comments Plugin article.