You need to first adjust the height of your ergonomic office chair. It is important to have the knees at a 90 degree position. While you can lock your chair into position using the lever at the very front to your right, we do not recommend doing this. The body is constantly moving throughout the day. Even moving one arm is another to shift your entire body weight slightly. Your ergonomic office chair should move fluidly with your body as it moves.
We also recommend that you set the tension control sufficiently tight so that you have to give your ergonomic office chair just a slight push to lean it back. If the tension is not tight enough, your chair will tip forward and backward with every little movement you make. The tension control is located at the bottom of your chair and can be easily accessed by tilting the chair to the back.
You should also use the lever located toward the back of the chair to set the angle for the backrest. Your ergonomic office chair is designed to support your lower back, which is the most critical area of your back where your spine curves the most. Once you get the angle right, you can set the height of the backrest by grabbing the backrest at the bottom with both hands and lifting up to ratchet the backrest at the optimal height for your back.
Next, adjust your seat using the lever on the left of your ergonomic office chair. Move the seat forward WITHOUT the front of the seat hitting the back of your legs. You can use the knob to adjust the actual pitch of the seat so that it tilts slightly backward or forward.
Finally, adjust the arms of your ergonomic chair so that they slide under the work surface where you are sitting and allow your arms to rest easily while using the mouse at your computer. Avoid putting the arms too high, as this can pinch the muscles between your shoulders and neck.