Set the pivot in the hole on the bottom of the door.
Hold the pivot straight up. Lightly tap the top of the pivot with a hammer. Tap the pivot until it's firmly seated.
Position the jamb bracket on the floor flush with the door frame. Place it level with the top track. Tighten the screws with a screwdriver.
Lift the door. Position the top pivot in the top track pivot bracket. Set the bottom pivot in the jamb bracket. Release the door.