How to configure Jriver 19 to Airport Express

I use to work with Itunes and was streaming audio to another room using Apple's Airport Express. Everything worked fine. I started to use Jriver 19 about 6 months ago and now want to use the Airport Express device to stream music in my living room. I have read a ton of threads on the Internet and looked at JRiver help section, which is really useless on that subject.

I have read that I needed to install the DBpoweramp Asset UPnP audio server which should be compatible with JRiver. I have created a living room zone and a Airport Express zone in JRiver which I can both see in the 'Playing Now' menu section. I have downloaded the main Library into the living room zone and no audio playing, what could be the problem?