Running addressable LED strip and rpi4

Im looking for the GPIO pin address in the code that controls the input for the LED’s, its probaby obvious but could someone point it out. I want to connect my strip to the pi but have no idea which pin is being used.

I would like to control an array of LED’s using this addon ofxGPIO by @kashim .

#include "ofMain.h"
#include "ofAppNoWindow.h"
#include "ofxGPIO.h"

class ofApp : public ofBaseApp
{
        public:
		LED apa;
		vector<ofColor> colors;
		int numLed;
		int brightness;
    
        void create_palett()
        {
            for(int i = 0; i < numLed; i++) {
                colors.push_back(ofColor(
                                         (int)ofRandom(0,255),
                                         (int)ofRandom(0,255),
                                         (int)ofRandom(0,255)
                                         ));
            }
        }

        void gen_palett()
        {
            for(int i = 0; i < numLed; i++) {
                colors[i] = ofColor(
                              (int)ofRandom(0,255),
                              (int)ofRandom(0,255),
                              (int)ofRandom(0,255)
                              );
            }
        }

		void setup()
		{
			brightness = 5;
			numLed     = 95;
			create_palett();
			apa.setupAPA102();
		}

		void update(){
			gen_palett();
			apa.setAPA102(numLed,colors,brightness);
			usleep(100000);
            //cycling from blackout up to max brightness
            if(brightness<31) brightness++;
            else brightness=0;
		}
		
		void exit(){
			ofLog()<<"Exit";
			apa.clearAPA102(numLed+5);
			ofExit(0);
		}

		
};

int main( ){
        ofAppNoWindow w;
	ofSetupOpenGL(&w,0,0, OF_WINDOW);
	ofRunApp( new ofApp() );
}

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