need help with LED controlling/disabling an out put

Using Arduino Project Guidance
1

i whan to disable on of the lied bun im not sure how to do it, and somebody told me that setting them
to an in put work,s but im not sure ho to do that

int led1 = 13;
int led2 = 12;
int led3 = 10;

void setup(){
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  
}
void loop(){
  pinMode(led3, INPUT); //this does not work
  digitalWrite(led1,HIGH);
  digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
  pinMode(led3, OUTPUT); //this does not work
  delay(500);
  
  pinMode(led1, INPUT); //this does not work
  digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
  digitalWrite(led3,HIGH);
  pinMode(led1, OUTPUT); //this does not work
  delay(500);

pinMode(led2, INPUT); //this does not work
  digitalWrite(led1,HIGH);
  digitalWrite(led2,HIGH);
  digitalWrite(led3,LOW);
  pinMode(led2, OUTPUT); //this does not work
  delay(500);
  
pinMode(led3, INPUT); //this does not work
  digitalWrite(led1,LOW);
  digitalWrite(led2,HIGH);
  digitalWrite(led3,HIGH);
  pinMode(led3, OUTPUT); //this does not work
  delay(500);

}
2 
int led1 = 13;
int led2 = 12;
int led3 = 10;

void setup(){
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT); 
  pinMode(led3, OUTPUT);
  
}
void loop(){

  pinMode(led3, INPUT); //this does not work ??? why???
  digitalWrite(led1,HIGH);
  digitalWrite(led2,LOW);
  // digitalWrite(led3,LOW); --> If you already set it to input, don't write
  delay(500);
  
  pinMode(led3, OUTPUT); //this does not work ??
  pinMode(led1, INPUT); //this does not work ??
  // digitalWrite(led1,LOW);  --> If you already set it to input, don't write
  digitalWrite(led2,LOW);
  digitalWrite(led3,HIGH);
  delay(500);
  
  pinMode(led1, OUTPUT); //this does not work ??
  pinMode(led2, INPUT); //this does not work ??
  digitalWrite(led1,HIGH);
//  digitalWrite(led2,HIGH);  --> If you already set it to input, don't write
  digitalWrite(led3,LOW);
  delay(500);
  
  pinMode(led2, OUTPUT); //this does not work ??
  pinMode(led3, INPUT); //this does not work ??
  digitalWrite(led1,LOW);
  digitalWrite(led2,HIGH);
//  digitalWrite(led3,HIGH);  --> If you already set it to input, don't write
  pinMode(led3, OUTPUT); //this does not work ??
  delay(500);

}