Need help hooking up my secondary hard drive!

I have a Master HArd Drive, I want to install a secondary hard drive, the problem is my instructions say to hook up the hard rvies on the same cable BUT if i want to move things from one hard drive to another i need to have a seperate cable. I looked in my computer and my cable slots are all (3) hooked up to something. How do I plug it in if i want to move things from one drive to another.

 

Sorry I mean ribbons by cables. Also how would I use this drive on my computer and what would I need to install?

 

bump

 

the ribbon cable that goes from the motherboard to the master hard drive should have another connector on it about half way along its lengh,this is where you plug it in. also remember to set it to "slave" with the jumpers on the back..
if you have no other connector on that ribbon cable go and buy one that has.