Adding Serial printing

I would l9ke to know how do I add Serial.PrintIn to this sketch?

/* Trinket/Gemma compatible IR read sketch
This sketch/program uses an Adafruit Trinket or Gemma
ATTiny85 based mini microcontroller and a PNA4602 or TSOP38238 to
read an IR code and perform a function.  In this
test program, tones are generated to a piezo speaker
but you can use codes to trigger any function you wish.
Based on Adafruit tutorial http://learn.adafruit.com/ir-sensor/using-an-ir-sensor
and http://learn.adafruit.com/trinket-gemma-mini-theramin-music-maker
*/
 
// We need to use the 'raw' pin reading methods because timing is very important here 
// and the digitalRead() procedure is slower!
#define IRpin_PIN  PINB // ATTiny85 had Port B pins
#define ledpin     4    // Piezo speaker on Trinket/Gemma Pin GPIO #4/D4
#define IRpin      3    // IR sensor - TSOP38238 on Pin GPIO #3 / D3
#define IRpin      2    // IR sensor - TSOP38238 on Pin GPIO #2 / D2
#define SPEAKERPIN 1    // Piezo speaker on Trinket/Gemma Pin GPIO #1/D1
#define SPEAKERPIN 0    // Piezo speaker on Trinket/Gemma Pin GPIO #0/D0
 
#define MAXPULSE    5000  // the maximum pulse we'll listen for - 5 milliseconds 
#define NUMPULSES    100  // max IR pulse pairs to sample
#define RESOLUTION     2  // // time between IR measurements
 
// we will store up to 100 pulse pairs (this is -a lot-, reduce if needed)
uint16_t pulses[100][2];   // pair is high and low pulse
uint16_t currentpulse = 0; // index for pulses we're storing
uint32_t irCode = 0;
 
void setup() {
  pinMode(ledpin, OUTPUT); // Output tones on Trinket/Gemma pin D4
  pinMode(IRpin, INPUT);       // Listen to IR receiver on Trinket/Gemma pin D3
  pinMode(IRpin, INPUT);       // Listen to IR receiver on Trinket/Gemma pin D2
  pinMode(SPEAKERPIN, OUTPUT); // Output tones on Trinket/Gemma pin D1
  pinMode(SPEAKERPIN, OUTPUT); // Output tones on Trinket/Gemma pin D0
}
 
void loop() {
  
  irCode=listenForIR(); // Wait for an IR Code
 
  // Process the pulses to get our code
  for (int i = 0; i < 32; i++) {
    irCode=irCode<<1;
    if((pulses[i][0] * RESOLUTION)>0&&(pulses[i][0] * RESOLUTION)<500) {
      irCode|=0; 
    } else {
      irCode|=1;
    }
  }
  if(irCode==1000,600)  {      // "1" on my remote, USE YOUR CODE HERE
    beep(SPEAKERPIN,400,500); }  // Make a 400 Hz beep
  else if (irCode==380,340) { // "2", USE YOUR OWN HEX CODE HERE
    beep(SPEAKERPIN,500,67530); }  // Make a 500 Hz beep
  else if (irCode==238,200.3,200,70,68) { // "3", USE YOUR OWN HEX CODE HERE
    beep(SPEAKERPIN,9050,65960); } // Make a 600 Hz beep
  else if (irCode==130,125,100) { // "4", USE YOUR OWN HEX CODE HERE
         (SPEAKERPIN,75950,9000);  // Make a 700 Hz beep
         
  }
  
} // end loop
 
 
uint16_t listenForIR() {  // IR receive code
  currentpulse = 0;
  while (1) {
   unsigned int highpulse, lowpulse;  // temporary storage timing
   highpulse = lowpulse = 0; // start out with no pulse length 
  
   while (IRpin_PIN & _BV(IRpin)) { // got a high pulse
      highpulse++; 
      delayMicroseconds(RESOLUTION);
      if (((highpulse >= MAXPULSE) && (currentpulse != 0))|| currentpulse == NUMPULSES) {
        return currentpulse; 
      }
   }
   pulses[currentpulse][0] = highpulse;
 
   while (! (IRpin_PIN & _BV(IRpin))) { // got a low pulse
      lowpulse++; 
      delayMicroseconds(RESOLUTION);
      if (((lowpulse >= MAXPULSE) && (currentpulse != 0))|| currentpulse == NUMPULSES) {
        return currentpulse; 
      }
   }
   pulses[currentpulse][1] = lowpulse;
   currentpulse++;
  }
}
 
// Generate a tone on speakerPin - Trinket/Gemma/ATTiny85 compatible
void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds)
{   // http://web.media.mit.edu/~leah/LilyPad/07_sound_code.html
          int x;   
          long delayAmount = (long)(1000000/frequencyInHertz);
          long loopTime = (long)((timeInMilliseconds*1000)/(delayAmount*2));
          for (x=0;x<loopTime;x++)   
          {  
              digitalWrite(speakerPin,HIGH);
              delayMicroseconds(delayAmount);
              digitalWrite(speakerPin,LOW);
              delayMicroseconds(delayAmount);
          }  
}

Split from an unrelated topic

DO NOT hijack threads

I've deleted your other cross-posts/hijacks @ecros4.

Cross-posting is against the rules of the forum. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend 15 minutes (or more) writing a detailed answer on this topic, without knowing that someone else already did the same in the other topic.

Repeated cross-posting will result in a suspension from the forum.

In the future, please take some time to pick the forum board that best suits the topic of your question and then only post once to that forum board. This is basic forum etiquette, as explained in the sticky "How to use this forum - please read." post you will find at the top of every forum board. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

Since you were already warned not to hijack threads, I'm giving you a 3 day suspension from the forum. I hope that when you return you will be more respectful of the rules.

if(irCode==1000,600) What's that?

the ir is my cable box remote pulses.

I'll try againif(irCode==1000,600)What do you expect that to do?