Dell Inspiron 3250 5.1 audio cabling?

Hi, 1st post here, just ordered a Dell Inspiron 3250.

I'm wondering how to cable for 5.1 surround sound.

I've seen nothing in the manuals about it, maybe I'm blind, point me to it if it exists and sorry...

Can you configure the line in/line out/mic so that you get 6 channels (5.1) out of them?

My receiver is a little old and does not have a HDMI input, only optical and 6 RCA jacks.

Thanks a lot,

Ed