Can't figure out how to change discs

I just bought a used Corolla that came with a 6 disc cd player. I can eject and load discs but I cannot figure out how to just move from one disc to the next. Right now I have to eject and reload which is a pain. The car did not come with any manuals at all. I have tried all the buttons on the cd player, even ones which obviously would not work, just to be sure I tried everything. Can anyone help? I have a multi-disk cd player in my home and changing discs is very simple. I just don’t know what I’m missing here. Any help would be greatly appreciated. Thank you.

Mary Ellen

please give us the name and model number of the cd changer / cd player.