FBML is deprecated, the "Static FBML" App is not available anymore.
You could try this now: https://www.facebook.com/staticHTML
I did not test it though, and the best way to create tabs is to create an app on your own:
It´s not really hard to do, tabs are just iframes and you can program the pages like a real website. Just keep in mind that you need a server with SSL for canvas apps and tab apps.