Save changes into SD

Using Arduino Storage
5

Hi tuxduino.

I tried to read the SD file and write on it and works perfectly. I use this code to read:

  if(!SD.begin(CS)){
    Serial.println("Tarjeta SD en mal estado");
    return;
  }
  Serial.println("Tarjeta OK");
       dataFile=SD.open("user.txt",FILE_READ);
    // read from the file until there's nothing else in it:
    while ( dataFile.available()) {
    	Serial.write(dataFile.read());
    }

And this is what I see in the Serial:

Tarjeta OK
char user1[]=67202;
char user2[]=62601;
char user3[]=60920;
char user4[]=61014;
Introduce PIN:

But the program did not recognize these arrays so If I enter the "67202" code it returns me an error.Maybe I have to extract the data from the SD byte to byte or something...I'm still trying thing and looking for information on internet with out results by now.

Thanks again for your time mate!