SATA CD/DVD Drive Connection

Hello, I want to add a second CD/DVD drive with SATA connection. I have the cables to connect it, but I don't know which SATA port to use on the motherboard.

There is a block of 6 SATA ports: 1 yellow, 1 dark blue, 1 light blue, 1 red, 1 white, and 1 black.

The white and black ports are occupied:
white = original CD/DVD drive
black = hard drive

Motherboard:
manufacturer: ASUS
motherboard name: IPIBL-LB
HP/Compaq motherboard name: Bencia- GL8E

<config>Windows Vista / Internet Explorer 9