Problem Rounding Edge

 From:  Mark Brown (MABROWN)
Hi Everyone,

I'm working on my first ever moi model (and my first nurbs model) as an exercise to learn the software. I'm really enjoying working on this.

I've hit a small snag which may be the way I've gone about creating a part of the model. I am creating a boat. I've just started on the cabin which follows the shape of the deck. There is a small base that the cabin sort of sits on. It has a rounded top edge. I have tried using the fillet tool but nothing happens.

I've included a couple of images to show what I'm trying to do.

Many thanks for any help given.