How should I operate the rotation of the top adjustment knob of AM02?

If you are using the VESA of the iMac, no adjustments are required, allowing you to enjoy optimal operation.
If you are using the Stand version of the iMac, please adhere to the following instructions:

2-1. Ensure that the iMac is securely mounted on the monitor arm.

2-2. Lower the monitor to its lowest height, then continue applying downward pressure until a "click" sound is heard. Afterward, rotate the knob to the next position.

Please note:
The knob should only be rotated when the monitor is at its lowest position. Do not attempt to rotate the knob at any other height.