How to hook up water lines. CORRECTLY!

how to hook up the water lines for a refrigerator/freezer Brand: GE Age: 5 - 10 years --------------------------------------------------------------------------------I just gotten a used GE Refrigerator/freezer and of course i do not have the manule to hook up the water lines correctly. I hooked them the way i thought it should go. I did get ice from the ice maker so i thought i had done it right. I did not any water from the water depenser. I thought it was cause it had to take time. I went out and came back only to find out that i had a leak from a extra water line, that did not get hooked up. Cause i did not see it, or it came loose from somewhere and i do not know where it gets hooked up to. It is a clear water line with a blue double coupleron it. So i know it needs to attach to something but what?, Can someone help I WANT MY WATER!. Or can you tell me how to hook the whole water lines correctly, please. My e mail address mindydougherty@rocketmail.com