The NVR still is used. Find the IP address of the NVR and place that in Blue Iris along with user and password and hit find/inspect.
Once if finds the NVR and camera 1, then add new camera and copy camera 1 and then change the camera number in the settings box to #2, repeat for the number of cameras you have.
Once if finds the NVR and camera 1, then add new camera and copy camera 1 and then change the camera number in the settings box to #2, repeat for the number of cameras you have.