I have a Panasonic TV how can i find the aux/line channel to play my xbox?

[Daniel]

I bought this TV from a furnature liquidator and i bought a universal remote. I can hook up my xbox to the back of the TV and i cant find the Aux channel!! My At&t u-verse works well on the TV but i cant play my xbox on this TV. please give me serious answers. PS i did switch through all the channels. the TV/video button doesnt do anything on the unversal remote or the at&t u-verse remote