Plug it into the mains and turn the dryer on by using the "o/-" on/off switch on the handle (lowest singular button on handle). To increase/decrease the speed, use the "+" or "-" buttons (the lower of the two sets of buttons), until you reach the desired speed. The Atmos Dry has three speed options, of which will be shown by the light indicators on the handle above the buttons, making it easy to see which level you are using. To increase/decrease the heat, use the "+" or "-" buttons (the higher of the two sets of buttons), until you reach the desired heat. The Atmos Dry also has three heat options, of which will be shown by the light indicators on the handle above the buttons, making it easy to see which level you are using. To use the cold shot, press and hold the button at the front of the hairdryer bandle, directly underneath the barrel. This will cool the hair and help to set the style. To use with concentrators, ensure the dryer is switched off, then attach the concentrator by holding it magnet-side facing to the corresponding magnet on the front of the dryer barrel, until it secures in place. The dryer is then ready to use.