Reply to KRK Question ... again !

This is the second time I've posted a question like this, because nobody really gave me a concrete answer.

I'm purchasing two KRK Rokit 5 Studio Moniters and I dont know how I will connect them to my computer ? I use a Kontrol S2, but I dont use the 2 RCA outs, I use my computers ASIO4ALL Soundcard as it is less glitchy.

a) how would I get the sound to come out of my computers headphone jack & into the speakers?
b) how would I get it to come out from ableton ?
c) how would i connect my S2's RCA to the rokits? (I only use the RCA outs when mixing on mixify)

Don't tell me to use the S2's outs, it glitches every five seconds !

Thanks guys ! Links to pictures would be great too !