To connect to your Facebook account you need to register Facebook application first. To learn how to register a Facebook application, review this article - https://www.codexworld.com/create-facebook-app-id-app-secret/.
Now, let’s enable Facebook plugin.
Now, let’s link to your Facebook account.
Locate Plugin tab.
Mouse over Page type and select Fan page.
Locate Fan Page name textbox and enter My Fan Page into it.
Locate App ID textbox and enter Facebook application ID you have copied once the application was created.
Locate App Secret textbox and enter the secret key you have copied once the application was created.
Locate OAuth Redirect URI field and copy the url.
Click Save button. Your screen should look similar to the screenshot below:
Locate Setting menu item in the left menu of your Facebook application control panel and click on it.
Locate Valid OAuth redirect URIs textbox and paste the url you have copied from OAuth Redirect URI field of the plugin settings.
Click Save Changes button.
Go to the Import section. To learn how to locate Import section, review step 1 of How to configure FW Gallery Content Plugin tutorial.
Click Link Facebook account button.
Once you are logged into your Facebook account, you will be able to export/import images in a few clicks.