Put the seat (A} on a smooth flat surfaces, attached one front leg (B} to the seat (A) use bolt (G}, lock washer (D) and flat washer (E) on both of hole of seat. Tum the Allen wrench (H) in bolt (G). But not too tight. Attached back leg (C) to the seat {A) use bolt (F), lock washer (D) and flat washer (E} on both of hole of seat. Tum the Allen wrench (H} in bolt (F). But not too tight. Stand chair up on an even surface and check that it is balanced.