Use the Wrench (C), Bolt (A) to secure the Support Bar (5) to the Leg (3, 4). Use the Wrench (C), Bolt (A) to secure the Support Bar (6) to the cross bar (7,8).
Use the Wrench (C), Bolt (B) to secure the Cross Bar (7, 8) to the Leg (3, 4). Use the Wrench (C), Bolt (A)(B) to secure the Legs (3,4) to the Back Frame (2) and Bolts (B), Wrench (C) to secure the Cross Bar (7,8) to the Back Frame (2) as per diagram.
Use the Wrench (C), Bolt (A) to secure the Seating Panel (1) to the Legs (3, 4).