1. Open developers Web site (https://developers.facebook.com/) –
2. Register as a Developer –
3. Goto My App section
4. Create New App –
5. Give some basic details about your Web Site
6. Then dashboard will open –
7. Goto Settings section below the dashboard.
8. Just click Add Platform and then choose Web Site option –
9. Fill up the required fields by entering your Web Site name –
10. Again goto Dashboard section.
11. And click show button to view the App ID and App Secret –
12. Copy that information from the dashboard.
13. Fill up the App ID and App Secret in Admin Settings, the place provided in the admin panel of your Web Site –
14. Now you can Sign up and Login into your Website with Facebook accounts