Hi,.... to change the video selector, that would be via the TV remote for the various video input. My guess is you only have two choices unless you connect other options to the TVs video inputs. One would be the TV for digital over-the-air from the outside TV antenna and the other would be an HDMI to the DVD player. The TV would have other video ports to use if you need to.
Regarding the USB, my guess is you may need to pull the head unit out to see if they connected the usb cable and if they did... determine where they routed the cable tol
good luck, Mark
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