How do you install carpet rods on a stair case?

Your first step would be to do a proper measuring of the length and number of steps needed to complete such a task. At this point you would need to cut the rods to the appropriate lengths. I would then prepare the surface designated to mount the carpet rods. You would now determine the proper hardware needed to mount the rods in the appropriate space. Attach all the rods and proceed to the carpet installation.