I have a 2004 Durango Limited with the VES, Infinity sound system, and the 6-Disc MP3 radio. It says on the front "6-Disc MP3" but I do not see anywhere to plug an iPod into? So what does it mean when it says MP3?

 

It means you can load your MP3s onto a CD and it will play them. Traditional "burning" of a CD means a dozen or so "tracks". With an MP3 CD Player, you can drop the MP3 files themselves straight onto a CD-R, fitting dozens and dozens or more onto it. The player will read the MP3s.