Create a new folder called "ScrollLCD_I2C" under the folder named "libraries" in your Arduino sketchbook folder. Create the folder "libraries" in case it does not exist yet. Place all the files in the "LiquidCrystal_I2C" folder.

To use the library in your own sketch, select it from Sketch > Import Library.

This library is based on work done by fdebrabander/Arduino-LiquidCrystal-I2C-library (https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library).