Hey graffig,
Without further detail I am assuming you are talking about attempting to access the plugin’s settings which can be done by going to your WordPress Dashboard – Facebook Feed – Customize – which then allows you to choose any of the different customization tabs such as (General, Post Layout, Typography, Misc, and Custom Translate/Text) which offer additional settings under each tab.
If this is the case then the problem you are experiencing would not be caused by the plugin itself as it has no “permission / access” features or restrictions built into it. You may be facing some type of WordPress “user” restriction or not logged in as an “administrator” to the WordPress program?
There may also be the possibility that there is another plugin installed that controls user privileges or access to plugins and the ability to modify, install, activate, deactivate or delete plugins.
Can you submit a request through our support page here which will let you send your plugin’s system info and site URL privately and we can dig deeper as to what might be the source of what you are experiencing?