I know Facebook put up a post about the new developer interface, but unfortunately, it looks like it's rolling out because we're still seeing the older interface:
developers.facebook.com/blog/post/518/
However, in the picture at the top of that post, I can easily see the App ID and Application Keys. I'm assuming the Secret key is there somewhere as well. Hopefully, you can see a similar window with the same information.
Once one of our accounts is upgraded, we'll be updating our configuration guide with the new details and pictures, but right now, I simply can't see what you're seeing.
Hope that helps, and sorry for the troubles,
Alex