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1. You already know how to connect an LED to the Arduino board.
2. This time, you need to connect the LED the same way but into different output number that supports PWM( what is this ) output
   In other word, with "~" by the side of the number of PIN.

3. Let's connect the LED to pin 9 as refer to : http://arduino.cc/en/Tutorial/Fade

   iFrame
   src http://arduino.cc/en/Tutorial/Fade width 960 id fadearduion height 600

4. Anchor
   pwmdescription pwmdescription

    PWM
   is 

   is "Pulse-width modulation", please refer to : http://arduino.cc/en/Tutorial/PWM

   iFrame
   src http://arduino.cc/en/Tutorial/PWM width 960 id pot height 600