Briefly soak feet in warm,sudsy water. Use the callus shaver gently to scrape dry,callused skin being careful not to rub too hard on the skin. Next, gently remove rough skin with the rasp. Follow with the smoothing file, rubbing in a circular motion for a final smoothing. Better effect with foot lotion after removing. To Change Blades: Place silicone disc on hard surface. Lay blade cover on the disc, press firmly and push away, releasing guard and blade from handle. Carefully place thumb and forefinger on sides of blade and lift to remove old blade. Replace new blade on center tab. Holding the tools' handle, place tool on to the disc. Press firmly against the disc and pull towards you to lock blade and metal guard ton place.   Warnings: Do not use if you have diabetes or poor blood circulation, or if there is any redness of inflammation in the area to be treated.people with circulatorydisease, infections, skin disorders, or foot injuriesshould seek medical advice before using.stop using ifany skin irritation occures.   Keep out of reach of children.