WP Favorite Posts

Hi,
I am having trouble displaying the “Favorite Posts” … From the instruction it said “insert {{wp-favorite-posts}} text into content section ” to display the Fav Posts , but what happened is after i inserted it only display just this >> {{wp-favorite-posts}} << (pure text) . Could some one please help me. Please show me how to make this work .

http://wordpress.org/extend/plugins/wp-favorite-posts/