Once you have entered your Facebook app id & secret key, then enter in the ID of your fan page. This can be found by visiting your fan page and finding the long number that occurs after your name.
You will know it is working correctly if underneath the Facebook ID & Secret it will give you the link to your applications wall.
Click on that link and visit your applications plugin. On their click “Add to my Page” and select your Facebook Page.
Once they are verified and added the app to our facebook page, you can enable the plugins you wish to do with SFC:
Enable the ones you want and click Save Changes.
You will be presented with more options.
To enable it to post your page, you need to grant access. Scroll to Publish settings and enable the Automatic Publishing.
Then click on Grant SFC Permissions and allow the tool to publish your posts to facebook.
You will know its working if you get successful Token Check messages that publishing and fan page publishing is ready to go.