mirandacastro on "[Plugin: Facebook Feed Grabber] Feed will not display"

I wonder if you can help me
I installed your widget but I cannot get it to work for our Facebook group: https://www.facebook.com/groups/edibleplantproject/?fref=ts
It's an open group
Our website is http://edibleplantproject.org
I'm an admin on the group
My browser is Firefox 21.0
Many thanks
Miranda

http://wordpress.org/extend/plugins/facebook-feed-grabber/