On this tutorial (and all others I could find) they show this image or similar:

I remember using this in the past for my page:
http://www.facebook.com/1919reykjavik
On this page I have 2 static FBML links on the left, and I would like to have a third one. However when I tried going into the edit screen, like the tutorial says, I get this:
i.e.: the add additional fbml box button is missing.
Is there a new way to do this that's even more obscure than the old one? Any ideas?
Thanks in advance.