Four-way lumbar support is adjusted using the four-way button (the round one) located on the side of the seat cushion. The lumbar support can be adjusted forward/backward and up/down.
Adjusting lumbar support
Press the four-way button up /down to move the lumbar support upward/downward.
Press the front part of the four-way button to increase lumbar support.
Press the rear part of the four-way button to decrease lumbar support.