How em I not able to use the USB Ports in the back of my Computer?

I'm having trouble being able to use my additional usb ports in the back of my AMD FX(tm) 4130 Quad Core Proccessor from iBUYPOWER, i'm trying to use these front 2 usb ports free for my ipod or iphone or just any other devices I may connect to and use the back ones for my keyboard/mouse. How could I enable em to work properly?

They should automatically work. If your PC is under warranty take it back, if not you could try re-installing all the motherboard drivers.