The Grove Starter Kit is a fun way to start on Arduino for young kids, because components can be easily plugged in, rather than needing to poke components into a board.
The first time I tried to use the Grove LCD RGB Backlight board, I was disappointed that it seemed to not work. I could change the backlight color, however no text would appear.
The simple resolution: The LCD specs state that it requires 5V to work. The Grove Base Shield has a slide switch to select 3.3V or 5V. Sensibly, it came preset to 3.3V. Slide it over to 5V and the LCD text starts working. When all else fails, RTM.