The LCD display needs six Arduino pins, all set to be digital outputs. It also needs 5V and GND connections.
There are quite a few connections to be made. Lining up the display with the top of the breadboard helps to identify its pins without too much counting, especially if the breadboard has its rows numbered with row 1 as the top row of the board. Do not forget, the long yellow lead that links the slider of the pot to pin 3 of the display. The 'pot' is used to control the contrast of the display.
You may find that your display is supplied without header pins attached to it. If so, follow the instructions in the next section.