If you are going to use both a shower curtain and a shower liner, you have two options for installation. You can either use one rod and one set of rings, or you can use two rods and two sets of rings. If you used one rod, line up the liner and the curtain so they are facing one another and thread one ring through each of the corresponding grommets on the both the liner and the curtain. The curtain liner will move as one unit. If you use two rods, you need one set of rings for each, and the liner and the curtain will move independently.