Forum:Facebook box

How do I add a small "Join us on Facebook box" on the main page? Here's an example of one used on a main page: http://thethreekingdoms.wikia.com/wiki/Gongjin%27s_Campaign_Memorials --Rayous(Talk) 11:35, September 24, 2011 (UTC)
 * Have a look at Help:Feeds --  Random Time  11:44, September 24, 2011 (UTC)