I had the same problem! I feel a little better knowing someone more tech-savvy with these router doohickie's couldn't get the sucker to work.
I went to their website and have no inkling where their so-called user manual is either, no search box, no message board - nada. I googled "fon user manual" and your page popped up. lol
After doing only two "lather rinse repeats" - they "told me" I had to call my ISP and get my IP address. Well, I have that so I will try it one last time. It's a pity - I don't intend to share signals, just wanted to cut down on all the cords around my desk. Luckily my ISP tech support is willing to help and it's not extra dough for third party hardware. But if that don't work...ah well...will have to fork over the moola for a real router