Mathew Brown
posted this on Jan 06 20:03
Visit https://developers.facebook.com/apps and click the Create New App button. Next type an App Name (This can be anything you want, the name you are
going to call your tab would be a good choice), agree to the Facebook terms and click Continue.

Click the edit icon link to upload the icon for your tab. Next, click the Page Tab section under Select how your app integrates with Facebook.

After you finish entering those 4 fields. Click the Save Changes button.