ASSEMBLY INSTRUCTION Step 1:Attach side mil arm (A) by pushing the bracket down to fit it. Step 2:Attach the Back Panel (B) to the arm (A) as shown. Step 3: Tighten the 4 Corner with Allen Key (1). Install the slats to side rail. Tighten the slats | Step 4: Attach trundle side panel (H) and trundle front panel (F) to trundle back panel (G) by with CSK screw (3). The distance of the slats should be sufficient to obtain desirable pushing the bracket down to fit it.