Unable to add a Camera.

I have been on the site, youtube and user manuals. I have secure 300 with 2 cameras. First one was installed by a tech, the other was done by me using the VOD help. I have another camera that I am trying to add, and when my touchpad starts the Locating camera step (after plugging it in with the white splitter, into the rounter, and then power. Then waited for the 2 solid lights) the touchpad says a camera was not located on your netwok. Help?