Slide a stud finder across the back wall of the closet space. Mark the location of each stud on the wall with a pencil.
Place one slotted shelf bar vertically along the two wall studs that are nearest each corner of the back wall. Position the bars 24 inches down from the ceiling using a tape measure. Place a level across the top ends of the slotted shelf bars. Adjust their positioning so that they are level. Mark the location of the mounting holes in the slotted shelf bars on the wall with a pencil.
Use a screw gun to drive the screws that were included with the slotted shelf bars through the mounting holes in the slotted shelf bars into the wall studs.
Pivot and slide the back end of each slotted shelf bracket into the slotted shelf bars. Pair the brackets at corresponding slots in the bars at four different heights to create the spacing for each shelf.
Center one white wood closet shelf over each pair of brackets. Drive the screws that were included with the brackets through the mounting holes in brackets into the bottom of the shelves with a screw gun.