Cancel camera from dashboard and swap basic plan to other camera

Hi, I have just purchased the ring plan basic for our ring door bell and non wired camera. I previously had another camera but it was faulty and sent back but is this is still on my dashboard as I can't seem to delete it off. The problem is that that this one has been included in my plan instead of the camera we have set up in our garden. How can I change the plan to include the working camera and cancel the on off the plan that has been returned. Many thanks