AUX port in the back of the stereo

Hi, I'm brand new to the forum (just bought my first car, a Renault Megane II 2004 1.5dCi)



Music is massive for me, and it's important that I can play my own music from my phone. I saw this http://ift.tt/1hrT598



But it doesn't say what button you need to get it to that function so it plays from the AUX port. Could someone please help me out and let me know?



Thanks in advance!