Facebook plugin: Facebook Developers Page?

Hi. Am enjoying the first days of setting up DT! Thank you very much.

Initially, I want to enable DT to set up new record for people who message my FB page. I worked through Extensions/Facebook in my DT admin page, got through the “Link Disciple tools to a Facebook app in order to get contacts…”

Things seem to enter easily.

However, I am not sure it all set up right because at the bottom of the guide after I entered my app ID and secret and clicked on “LogIn with FB” it showed: “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.”

“Refresh Page List” button, when clicked showed: “2018-08-07 01:15:08pm An active access token must be used to query information about the current user”

“Save Page Settings” button, when clicked, took me back to Extensions button in my DT admin page. No other notification.

“Get recent conversations” button took me back to Extensions button also.

Suggestions?

Thank you very much.

The page I need help with: [log in to see the link]