NVR should have ability to manually add a camera
WiFi camera needs to be connected to the local network and NVR needs to be connected to the same network
Many dlink cameras use ONVIF(open network video interface) protocols, not sure about the 825l
Go into the NVRs camera setup menu and select an open camera port.
Each camera needs its own port even if it is not physically connected to the NVR, so an 8 camera NVR can not support 9 cameras
If you use port 6, for example, on the NVR for a networked(wifi) camera then you can not plug in a wired camera to that port.
On some NVRs you will need to plug in a cat5 cable to the port selected and that cable needs to be connected to the network(router/switch), the NVRs "internet" cat5 won't see a camera.
If you only have the 1 cat5 cable then get a 4 or 5 port switch to get the extra ports needed at the NVR location
Select manual setup and enter the IP address of the wifi camera, and select type as ONVIF and then user name and password of the camera(info YOU put in to camera when you set it up)
See if that works