TEA5767 Fm Radio Spirit Box

I havent worked with "for" sketches yet so i am lost again adding a switch to it.

Usually i would read the switch state and write it to an output, right?
But in this case there is no output as it writes to the radio shield in serial if i understand right?

#include <TEA5767.h>
#include <TM1637Display.h>
#include <Wire.h>
#include <TEA5767Radio.h>
int buttonState = 0;         
const int buttonPin = 1;     
const int CLK = 9; 
const int DIO = 8; 
TEA5767Radio radio = TEA5767Radio();
TM1637Display display(CLK, DIO);  //set up the 4-Digit Display.

void setup()
{ 
   Serial.begin(9600);
   unsigned char buf[5];
   Wire.begin();
   display.setBrightness(0x0a);  //set the diplay to maximum brightness
}
void loop ()
{
buttonState = digitalRead(buttonPin);
 if (buttonState == HIGH) {
   

for ( int i = 750 ; i < 1100 ; i++ ) {
  float freq1 = i/10.0 ;
  radio.setFrequency(freq1); // pick your own frequency
  display.showNumberDec(i);
  delay(100);

}} else {

for ( int i = 1100 ; i >= 750 ; i-- ) {
  float freq = i/10.0 ;
  radio.setFrequency(freq); // pick your own frequency
  display.showNumberDec(i);
  delay(100);
}}}