Visit the facebook like box plugin page.
1.Enter your facebook page id.
To find your facebook fan page id:
Go to your facebook fan page and the last numbers after / in your browser address bar is facebook page id.
2.Adjust the like box width.
3.Set the connection limt.It shows how many users like your fan page.
4.Check show stream if you want to show the public stream and check show header if you want to show find us on facebook bar at top.
5Click Get Code button.