Does anyone know how to install speakers on a computer?

Tweet

I got my computer 2nd hand from someone and it didn't have speakers hooked up. I got some speakers from a thrift store but they did not have instructions in them. I have a Dell Pentium II (I know its outdated, but it was FREE!) I don't know which plug to connect the speakers to. They are Polk Audio speakers. Is there a website online I could get instructions from? Help!