I2C LCD Interface
Arduino Library : LiquidCrystal_V1.2.1.zip
written by : F Malpartida
You can read a lot about example and explanation regarding the library here.
After download the library, you need to install the library. If you don't know how to install the library, you can refer here as a guideline.
Complete reference : arduino-info.wikispaces
+ GND - GND
+ VCC - 5V
+ SDA - UNO ANALOG Pin 4 / MEGA digital pin 20
+ SCL - UNO ANALOG pin 5 / MEGA digital pin 21