D-Link DCS-930L :: Changed Port Number Now Cannot Access Video?

With basic "Wizard" setup I got DHCP and port 80 for the camera.  It was working just fine with MyDLink and locally with DLink-ViewCam software and some local test web pages. However, we have a wireless printer on that router which also uses port 80, so when it was installed we set up a "port forward" for port 80 traffic to it for administration from other subnets.  How MyDLink website is able to tunnel through our hardware firewall and the wireless routers firewall to  communicate with the camera is not clear to me (perhaps someone can send me a link to an explanation??), but it works...Thus, to allow access to the camera from other subents, I wanted to change the camera's port from 80 to another, say 8181 and set up the appropriate "port forwarding for TCP and UDP.  All of the steps below were from a PC within the camera's subnet/router so port forwarding is not an issue