You have to setup fb application and config plugin with your app key. Here http://wordpress.org/extend/plugins/facebook-comments-for-wordpress/installation/ is info how.
Here is screenshot: paste key in first input box as in picture.
And just a friendly advice, use built in WordPress comments, believe me they work so much better. Fb comments – been there, done that, it just ain’t worth it. They are buggy and ugly.
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