If the Moderation Tool of FB is not showing on your 'Facebook Comments' element, please check the following:
1. You are logged in to your Facebook account, http://www.facebook.com/.
2. You had set yourself as an administrator or developer.
For more information on FB APP Roles, please check here: https://developers.facebook.com/docs/apps/security
3. Ensure that the URL set under 'Facebook Comments Source URL' section is an EXISTING and PUBLISHED page, else leave it blank.
If you have issue with setting up Facebook APP, please let us know or you can also review our guide here: https://optimizepress.zendesk.com/hc/en-us/articles/200874728-Setup-Facebook-Comments-Facebook-App-ID