I own a 2006 Eclipse GS and I have no clue how to use my MP3, I want to plug my Galaxy Note 4 in and listen to music, my fiance and her parents all have the same phone and can plug their phones into their cars and listen to music so if anyone knows how that would really help me out thanks

 

The 2006 GS does not look like it has an aux input, it probably doesn't have bluetooth either.

You can install an aux connector to the wiring, here's a how-to video:

Either that or replace the head unit with a more modern one that supports aux in/bt/usb.

 

Don't replace head for 400 dollars..go to wallmart buy a remote bluetooth connector..it plugs into cigarette lighter and connects remotely to your radio for only 20 bucks