Hi Laurie, you might struggle a bit to find someone who can pick this up for a couple minutes. I went through teaching myself dunning and spent the better part of 20 hours figuring it all out, and I'm definitely not good enough with it to just pick it up and run with it. Without having to reteach myself a bit of it.
Couple pointers though... one of the pieces that still displays as an option was deprecated and they aren't very good at indicating that within the user interface. I think you have to use letter templates instead of just the code boxes on the template. I copied the code from the other tool into the template but I want to say it was the full length one I was eventually able to get to work with a few modifications.