Use Wrench (D), Secure (A) to secure the Side Frame (3) to the Support Bar (5). Use Wrench (D), Secure (A), Bolt (B), and Nut (C) to secure the Side Frame (4) to the Back Frame (1), Seat Frame (2), and Support Bar (5), and put the Seat Cushion (6) on top of the Seat Frame (2).