Mini Ultra Pro – Serial.print

Hi all

It is the first time for me, to work with arduino and the rocket scream mini ultra pro.
I followed the Mini Ultra Pro Hookup Guide and could let the led blink. So I think no problems with IDE or drivers. But I wonder how I can log to the serial monitor…
I tried following:

*************
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println(“Start Sketch”);
pinMode(13, OUTPUT);
}

void loop() {
for (int i=0; i < 10; i++){
blinken(i);
Serial.println(i);
}
}

void blinken(int highTimeFactor){ // Anweisungsblock Start
digitalWrite(13, HIGH);
delay(100*highTimeFactor);
digitalWrite(13, LOW);
delay(100);
}
**********************
And I tried different baud rates, but I can’t see a log in the serial monitor.

Can someone give a sugestion?

Thanks, Lukas