Please refer to https://github.com/gmacario/learning-arduino to get the Fritzing schematics and the corresponding the Arduino sketches.
Read documentation at http://arduino.cc/en/Main/ArduinoBoardYun
Start Arduino IDE (version 1.5.6 or later)
Arduino: File > Examples > 01.Basics > Blink
Arduino: Tools > Board > Arduino Yun
Arduino: Tools > Port > COMxx (Arduino Yun)
Arduino: File > Upload
Verify that L13 is blinking every 1000 msec
Adjust the values in the
delay(xxx) instruction after each
digitalWrite, upload the new sketch and verify that the blinking rate
is changing accordingly.