You can use any wifi extender that has a network port then plug that into the NVR. Or you can use powerline adaptors to get the network connection to your router.
@JB1970 ok bare with me mate, Im new at this. I have a TP LINK 300mb USB Wifi stick, a TP LINK TU9H USB wifi, and a white extender I think it is. I'll attach pics of what i have pal. What my plan is is to use my phone as the router as thats how i connect my laptop to the net