Thanks for your reply. I'll admit I'm a little out of my depth here---what am I assigning the IP address---My computer, my cameras, my NVR, etc? There are lots of IP addresses in all of these set up menus and I'm not totally sure which I'm supposed to be editing.
I can see the cameras on the NVR monitor, and was able to get them to show up on my computer's browser (problem seemed to be that Firefox wasn't able to connect but IE was) and managed to get them to show up (on WIFI only) on iDMSS, but I have been unable to view remotely with cellular data (I'm on the Sprint network).