Twist the inner portion of a tension shower rod to lengthen the entire unit. Set the length at approximately 1 inch shorter than the space in which it will be hanging. Position the rod in place and continue twisting until it fits firmly between the supporting walls. Typically, the shower curtain rod should be positioned approximately 75 inches above the floor. Use a step stool, if necessary.
Open the curtain rings and place them on the rod. Make sure any decorative details are facing forward.
Turn the curtain and/or curtain liner so that the wrong side faces in toward the shower. If using a liner, grasp the coordinating holes for both the liner and the curtain together and attach them as one unit. Starting at one end of the rod, push the holes in the top of the liner/curtain onto the ends of the rings. Clasp each ring shut as you make your way along the rod.
Adjust the height of your shower curtain, if needed, by twisting the rod once or twice to shorten it slightly. Move the rod so that the curtain is even and hanging approximately 3 to 5 inches from the floor, then readjust the tension so the rod is secure.