Pioneer Aux connection

[chets5]

Hi all

I have currently installed the Pioneer headunit below

https://www.pioneer.eu/eur/products/arch ... 00MP/index

I have now been told I can use the CD changer connection to connect any aux connection to it. I was wondering if anyone can suggest the best way for this.
It would be great if i can get the wire to sit the middle console so any mp3 player, ipod can still be controlled easily.

Any pics would be helpful too