How to put more than one disc in 05 Ford Taurus car cd player?

On my car, it says "Tune" and then under it, it says "Disc 1-6". I assume that means that you can have 6 cds in the player at once. I just don't know how to do that. I have a 2005 Ford Taurus SE.How to put more than one disc in 05 Ford Taurus car cd player?That car comes with an optional 6 disc changer in the trunk. If your car doesn't have the changer then that button will not do anything.How to put more than one disc in 05 Ford Taurus car cd player?HIT THE LOAD