I need to change the channels programmed into my...

Question

I got an old tv from a friend without the remote. It is a GE 8-2060. I got a universal remote, but I cannot get any channels on the tv other than what has been original programmed and my kids want to hook it up to their PS3. They have itr hooked up to AV variable thing on the back of the tv, but we cannot get the tv on the right line or channel to work the PS3. Can you help this electronically challenged single mom of 4 impaient kids?