Combining push button and Serial.read to make led on and off.

int switch1 = 2;
int motorled1 = 3;
int switch2 = 4;
int motorled2 = 5;
int d1 = 0;
int d2 = 0;
int buzzer;
char reset1;

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);

pinMode(2, INPUT);
pinMode(4, INPUT);
pinMode(3, OUTPUT);
pinMode(5, OUTPUT);

}

void loop() {
// put your main code here, to run repeatedly:

d1 = digitalRead(2);
d2 = digitalRead(4);
if (d1 == 1 && buzzer == 0)

{
digitalWrite(motorled1, HIGH);
buzzer = 1;

}

else if (d2 == 1 && buzzer == 0)
{
digitalWrite(motorled2, HIGH);
buzzer = 2;
}

if (Serial.available() > 0)

{
(Serial.write(buzzer));

reset1 = (Serial.read());
buzzer = 0;

if (reset1 == 'R')
Serial.println("LED is off");
{ digitalWrite(motorled1, LOW);
digitalWrite(motorled2, LOW);

}
}
}

This is the answer. I modified the code.