1. Position the sharpener close to the edge of counter or work-surface and depress the lever to firmly attach the suction cup. 2. Select the middle aperture with tungsten carbide for restoring chipped or damaged blades as it sharpens very aggressively. Select the left aperture with crossed diamond rods for fast sharpening of blunt knives. Select the aperture with crossed white ceramic rods for fine honing, or deburring after tungsten or diamond usage. 3. Hold the knife with one hand, and ensure your free hand is kept well away from the knife cutting edge. 4. Initially select the pre-set carbides, or diamond crossed rods, hold the knife in the vertical position and draw the blade in a steady motion from the heel to the tip of the blade, Just normally around 3 to 5 times. 5. Repeat this operation approximately 5 to 10 times on the opposite ceramic aperture, to hone or remove any burrs as created by the tungsten-carbide or diamond. 6. Sharpen the knife in one direction, pulling it vertically from heel to tip towards you, then lifting the knife and repeat this operation in the same direction. DO NOT pull and push the blade in different directions. 7. If the white ceramics become visibly dirty and impregnated with metal, clean them with a brush or cloth using soap or a detergent