It's unlikely that you will be able to get 5.1 surround sound using those computer speakers. Each of those three 3.5mm jacks handle two of the five speakers (and the sub). There is no adapter that I'm aware of that can convert a digital signal to three distinct analog signals.
Thank you for the reply.
I managed find a 5.1 analog to RCA converter. Now I have another question, I am able to connect the RCA to 3.5mm cable to my television. By connecting a digital coaxial cable between my tv and blu-ray player, will that be able to transmit 5.1 surround sound through the speakers?
I have not bought anything yet, as I am still trying to figure out what would be the best solution. I have switched
the blu-ray player to rather using the SONY BDP - s490 player.