Another question about home cctv

I have a fairly decent cctv system but the instructions and user manual are hopeless, I have even downloaded and printed the100 page version.

I have managed to get it online and thanks to some recent help get it connected to a time server. I wish to network it so that I can view it on other devices like my phone or other PCs on the network. I have looked on Google forums as well as the manual but I don’t understand terms like “Mapping” or “Port Forwarding” also tried downloading and installing suggested apps to no avail. System is Annke , nearly forgot to say that. Anyone here that understands this sort of thing.