There are instructions in the December 1998 Sew News.  They wanted you to cut two 18 inch circles per napkin, put them wrong sides together, fold and roll hem the raw edges.
But I found it too bulky and a waste of expensive fabric.
The article also used a green thread for the rolled hem and I thought a gold would look
more like a Christmas tree trim. The original instructions were very confusing!

Instructions:
Cut 1 - 17 inch circle for each napkin, folded it in half and serged the raw edges.
I used gold Wooly Nylon in my upper and lower looper for the rolled hem.
I used Fray Check on the tails and then snipped the tails.

The folding tip!
The folding is the hard part for everyone.  I put the half circle so the fold is on my left and then I start folding from the bottom up looking at the picture makes it easier and it worked!