How to use a ceramic knife sharpening rod

The blade is at a 20-degree angle to the sharpening rod.
Sharpen one side of the knife first. The blade of the knife is against the tip of the sharpening rod with the handle part of the knife, and the blade is at a 20-degree angle to the sharpening rod.
Slide the blade to the bottom of the sharpening rod, and at the same time, the contact surface slides from the handle to the blade. Grind gently, do not use force. Until the tip of the knife just slides to the bottom of the sharpening rod.
Grind the other side. Grind several times. Keep grinding the same amount on both sides.