The LCD Keypad Shield plugged into the Arduino controller, then you need to download LCD4Bit_mod.h (Right Save As) library file to arduino-0015 hardware libraries, followed by a test program compiled below and then download to the Arduino, the initial use LCD Keypad Shield, the first observation LCD has no display character, if the character does not appear likely that the contrast is not correct, you can use the screwdriver adjust RP1 (clockwise rotation), characters can be transferred to emerge clearly