adding a tare function to a functiioning arduino scale

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Here hope this helps:
Probably not the best code but give it a shot

#include <HX711_ADC.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

HX711_ADC LoadCell(4, 5);
LiquidCrystal_I2C lcd(0x27,20,4);

const int tarePin = 12;  //Tare button at pin 12
float tareVal = 0;
float i=0;

void setup() {
  LoadCell.begin();
  LoadCell.start (2000);
  LoadCell.setCalFactor(1.0);
  lcd.init();
  lcd.backlight();
  pinMode(tarePin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  if(tarePin == HIGH){
    //If push button is pressed
    if(tareVal==0){
      //Assign new tare
      LoadCell.update();
      tareVal = LoadCell.getData();
      delay(100);
    }else{
      //When tare is assigned already and button is pressed clear tare
      tareVal = 0;
    }
  }
  LoadCell.update();
  i = (LoadCell.getData() - tareVal); 
  lcd.setCursor(0, 0);
  lcd.print("Weight[g]:");
  lcd.setCursor(0, 1);
  lcd.print(i);  
  
}