|The box has 4 of the red/white/yellow inputs? It's not going to matter which device is plugged into which of the 4 options. The box doesn't care which is which. Just make sure you get red-to-red, white-to-white, etc. on each device.|
Also depending on your TV model and its age, it may have more than one A/V input. I've got an old JVC and it has the regular coax input for an antenna--you can hook up a VCR there--and then A/V inputs for two more devices. Then I select which input I want with the remote.