Need help connecting speakers

[GrungyHobo]

My mobo has a blue, green,pink, orange, black, and grey audio ports. But I have a speaker system that came with a dell I used to have and its plug-ins are yellow, black, and greenish white. Now I assume that the black goes into the black where do the other two go?

 

[fmw]

You have a surround sound mainboard and stereo speakers. The green one goes to the green port on the mainboard. The others probably go to a subwoofer or other central unit or to each other depending on how it is designed. Review the instructions.