@N_J_H, welcome to the community, and I hope you don’t mind me moving your post to a separated topic for this specific Reolink NVR settings, so this topic can be found more easily by others who may be interested as well.
This is referring to @Kent’s post where his dashboards and NVR setup is shared.
I can help answer a couple questions here, and @Kent please feel free to jump in.
You should replace the (IP address) with your Reolink NVR’s ip address (192.168.0.xx). I’d assume the channel name to be just “5”, and you should be able to find out by giving it a try.
If it still doesn’t work, you may want to post the URL you tried so @Kent may understand better the issue(s). (Of course, you should remove/mask the username and password in the url.)