HDTV LCD 32". Need help connecting RCA cables.

I have on the back of my Sanyo three inputs for RCA cables. We're on cable here. I need to know which connections to use. The three inputs are as thus: Video 1, Video 2, and Video 3. After I connect the RCA cables, how do I make sure the signal will be read from the vcr to the tv? Do I chose Video 1 with the remote?