Once Commenting has been enabled, you can return to the People tab to change the commenting reading and writing rules at any time. Changes will apply to all future comments.
To update commenting settings:
-Navigate to the People tab and select Comments
-Click on Settings
-Make changes and click Save to apply
Reading Rules and Writing Rules:
-Everyone - Anyone who visits your website, without access.
-Only Users - A user who has a login & has registered, but does not have access.
-Only Users with access - A user who has registered and has access to this content