Error on Set-up

Hi,

I am trying to set up my Facebook Post to Pages but when I click “Connect Your App” I am not getting the popup. I am getting:

Can’t Load URL: The domain of this URL isn’t included in the app’s domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.

I have entered my Valid OAuth redirect URIs in the appropriate spot on the FB settings page:

https://www.motorsportprospects.com/wp-admin/admin.php?page=geodirectory&tab=facebook_integration

It must not be connecting because GD does not allow me to set “Post to Page.”

Not sure what I am doing wrong.