Schematic interpretation, where to put resister?
Neither are shown in that schematic, as described in the text.

Calibration Circuit: The weight calibration circuit is shown in figure 2. [...]
[A schematic that includes a 4.7kohm resistor]

...

Note: Cathode and Anode pin of LCD (pin 15 and pin 16) is not shown in circuit diagram. Connect +5 volt to pin 15 with current limiting resistor (generally 100-ohm) and pin 16 of LCD to ground.