Go to the little wheel or whatever it's called at the bottom of the screen, choose account and you have the option to click "show friend list". It displays all your friends. You add them when you go to their profile and click "in friend list".
Hi Lucy. Thanks for taking the time to help.
I've looked at the lower right hand corner of the screen, and clicked the cog (the little wheel you spoke of ). When I clicked Account, there are three options -----Show Animation, Unbind account, Delete Account --- but no show friends list. I should point out that I am running Google Chrome on a Linux distribution called Ubuntu, so it may not be rendering all the options properly.
Also forgot to mention, I am not a Facebook player, but instead play the game through Kongegrate.