Programming AUX as a channel.

Question

This is my Dad's tv. It has an input on the back for AUX and we've hooked up a new dvd/vcr to it. The tv remote is gone. With the buttons on the tv, I can access the menu and can get to the aux screen but I can't get the channel lineup to accept the aux selection. I have to mannually select the aux from the set. I want it so he can select channel 2 and then channel down 1 time to Aux.