a little more info would be good , anyway if the drive is a second drive first you have to make sure the jumper on the back is set to slave ,then install into the pc after that there are two cables a ribbon cable it looks flat and about 2" wide that goes in the back of the drive , and there is a power molex
that looks like a plastic plug with four coulerd wires comming out of it that goes into the back of the drive and that is it, make sure the power molex is in the right way round it should only fit one way.