Configuring the PRO version.

Open your WordPress Website Dashboard and Navigate to Settings>Facebook Secret Meta.

You will be taken to Facebook Secret Meta Pro Options.

The default for All Pages

First either pick the Use Blog Name or Use Custom Text option. Remember, you can always change the default.
Paste your Official Facebook Page’s URL in the Site's Main Facebook URL field.

For Single Post/Article

Text

Default.
Post Author Name. (Use the drop-down menu and pick an Author Name)3.Custom Text.

Author's Facebook URL