changing baud rate of the GPS

I saw your comment in on GPS (, and you said to change the baudrate of the GPS i have to send in the command "$PMTK251,38400*27".

May I know what is the program that i have to run first, on the Arduino in order to allow me to send this command succesfully?
I tried sending it while running the following, but it ignored it:

void setup(){

void loop(){
    Serial.print(, BYTE);

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