I'm trying to install an aux cable to my mitsubishi galant 2008

What is your question?

I'm trying to install an aux cable to my mitsubishi galant 2008. I recently learned that holding down the CD button is a good way to check if your car is aux capable. I did that but nothing came up, can i install a new radio that is aux capable? or is my car in general not capable? I checked the box and i saw that the pin all the way at the corner was 10 pin connector. Thank you