How can I make pin assignments change

I am working on a slot car timer project and need help with my tinkerkit LCD.

This sketch I want to use uses no serial hook up like the Tinkerkit mod board does. Please someone advise me how yo make this code work with a TX/RX hook up.

The beginning of the code is as follows

#include <LiquidCrystal.h>

/*

VERSION 0.3 

-Added Green LED For Best Round

*/


// PIN CONFIGURATION
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int laserPin = 13;
int buttonPin1 = 7;
int buttonPin2 = 8;
int speakerPin = 9;
int ledPin1 = 0; // red 
int ledPin2 = 1; // red
int ledPin3 = 10; // green


/*

 States // The central state the timer is in
 
 0 = pause;
 1 = countdown;
 2 = running;
 
*/


int state = 0;
boolean displayLastRound = true;
boolean running = false;

int lightLevel = 0;
long lastHit = 0; //time of the last hit in the barrier (absolut)
boolean lock; // locks the light barrier while a car is passing. The look is removed as soon the car left the lightbeam and the roundTreshold time has passed

long lastRound = 0; // time of the lastround (absolut)
long bestRound = 0; // time of the bestround (relative)
int roundNr = 0;


int laserTreshold = 10;
int roundTreshold = 300; // minimum time that has to pass before a new round is counted

// Absolut time for pressing buttons
long lastPress1 = 0;
long lastPress2 = 0;


// LED Timer

long timeLEDGreen = 0;

void setup() {
  pinMode(laserPin, OUTPUT);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(speakerPin, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);


  lcd.setCursor(0, 0);
  lcd.print("Arduino");
  lcd.setCursor(0, 1);
  lcd.print("Laser Lap Timer  ");
  
  delay(1500);
  
  lcd.setCursor(0, 0);
  lcd.print("Christoph &");
  lcd.setCursor(0, 1);
  lcd.print("Peter Halang    ");


  //Serial.begin(9600);
  delay(1500);

}

serial-layout1.png

I would think that you must, First Read The D*mn instructions for the Tinkerkit Serial Display... Add softwareSerial to your program and then modify the 'code' to redirect LCD writes to serial print statements that are formatted for the Tinkerkit device. At any rate you are asking someone else to think for you and to do your work for you... without providing the relevant data..

Doc