We can supply everything with 5V so don't worry. Connect GND and 5V to the LCD and the HX711 ADC. Connect one side of the push buttons to GND and the other side, one to D8 and the other button to D11 of the Arduino. Connect data and clock for the LCD to pins A4 and A5 and also data and clock from the ADC to pins D3 and D2. Connect the laod cell as below, and follow the color of the wires.
