Change Icon on "Friends" Plugin in Admin Menu

I noticed the the Friends plugin does not have an icon. I am attempting to use the icon: content: "f483"; from Dashicons, by placing it in the stylesheet. but I can not do so, because I do not know where it goes in the Friends plugin stylesheet. Any idea? The code I was looking for using is similar to the code found here:

http://www.wpoptimus.com/694/use-dashicons-wordpress-admin-menu-plugin-theme/