wiring rear speaker to standard head unit

hi there i got a renault clio 1.2 campus sport... i have replaced the front standard speakers with new speaks a while back and now i got some speakers for the rear of the car... problem the car never came with rear speakers this could be a really stupid question but i have taken the standard radio out and at the imputs for the radio i researched a diagram of what each wire is and what it means and it appears that there are wires for the back speakers. I don't know were these wires are for the speakers. They are not in the speaker slots as far as i am aware. i have looked but could not find them any help for this problem would be much appricated..... :smile: