Thanks again, Kakashi. I have already done the steps you mentioned: checked the DHCP list at the router´s configuration page, then entered the IP address at the browser (then I was able to see the camera´s image, after clicking on "java", and later I was able to update its firmware).
Unfortunatelly my router is not D-Link, so I do not have the MyDLink Zero Configuration. Sorry for my ignorance (English is not my native language, I am Brazilian), but what does "PM" mean? ("... please PM me and be ready for...")
I was wondering if it´s not a port issue.
I will download the mydlink™ Lite app at my Android device and see what I get.
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Updating:
I have managed to see the camera through Mydlink Lite App at home! Uhuuuuuuu! Does that mean that I don´t need the setup wizzard anymore to setup the cameras at the store (where I need the cameras), now that I was able to create a Mydlink account? Maybe I just need to open the app at the store, with the store´s router, and try to "see" the camera again, and then add the other 3 cameras. Is that correct?