If you want Fenix help, then the Div book/manual really isn;t enough - Fenix has evolved significantly since the early days when it was very much a carbon copy of Div.
If you've tried the official site, then there's also BooleanSoup - A fun friendly site to discuss Fenix difficulties is
http://www.booleansoup.com/index.php?p=32
There is a specific section devoted to Fenix.
It doesn't cover everything but if you are starting out it's a great reference and I have found very little in that manual which isn't relevant to Fenix now. I still use it as a quick reference myself on occasion. It also has some good beginner tutorials. If you can find it cheap get it.
Edit:
Don't forget if you have any specific questions I'm sure all the Fenix users here would be willing to help out.