And then it's usually recommended that you set the cameras to have fixed (not dynamic) IP addresses. As awesum140 says above, connect them one at a time and let them be assigned IP addresses by the NVR. Then you can connect to them and make adjustments.
I don't know much about MAC, but from what I've read, these cameras won't play well with the browser(s) on a MAC. I use a browser called "Pale Moon" (32 bit) on a Windows machine to directly set up my cameras. The 32 Bit version still allows the use of the appropriate plug-ins that the cameras require.