Back LockControl Location: Left hand side of the chair.To lock the back, push the lever down. To use the chair in free-float mode, ensure the lever is in its neutral position. To adjust the back into one of the 4 positions, put the chair in free float mode, push on the back support to your desired position and relock by pushing the lever down.Lumbar AdjustmentControl Location: Back of the chairTo adjust the lumbar support, use both hands and reach around the back of the chair. Pull up or push down the lumbar panel using equal pressure on the two tabs until at the desired position.Seat HeightControl Location: Right hand side of the chairTo adjust the height of the chair, pull the outside lever upwards and release when at the desired height. If the user is sitting on the chair, the seat will go down. Remove the weight from the seat to adjust the seat up.Seat DepthControl Location: Right hand side of the chairTo adjust the seat depth of the chair, sit on the chair and push down the inside lever. Slide the seat and release when at the desired depth.Armrest HeightControl Location: Outside of armsTo adjust the arm height up or down, press and hold the control whilst pushing the arm up or down and release when at the desired height.Armpad Rotation, Width & Slide (Optional)Control Location: Inside of armsTo rotate or adjust the width of the armpad, press and hold the control whilst rotating the armpad in or out/ pushing in or out the armpad. Release when at the desired position.Headrest Height & Depth (Optional)Control Location: HeadrestUsing the two pivot design, adjust the headrest forwards and backwards.