How to set the network address?

#include <SPI.h>
#include <WiFiNINA.h>
 

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
/////// Wifi Settings ///////
char ssid[] = "Xavier";
char pass[] = "19961006";
int keyIndex = 0;                 // your network key Index number (needed only for WEP)
int trigPin=2;
int echoPin=3;

long duration;
int distance=500;

int status = WL_IDLE_STATUS;

WiFiServer server(80);

String readString;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  Serial.begin(9600);

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
  }
  // you're connected now, so print out the status:
  printWiFiStatus();

  server.begin();
}


void loop() {

  // listen for incoming clients
  WiFiClient client = server.available();

  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();// Read char by char HTTP request
        readString += c;
        Serial.write(c);

        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<head><title>WiFi Sensor</title></head>");
          client.println("<center><hr/><p> Click the Buttons to view the charge point. <p/><hr/></center>");
          client.println("<center><input type=button value='Detect' onmousedown=location.href='/?DETECT'></center><hr/>");
          if (distance<= 200) {
            client.println("<center><hr/><p> Occupied. <p/><hr/></center>");
          } else {
            client.println("<center><hr/><p> Unoccupied. <p/><hr/></center>");
          }
          client.println("<hr/>");
          client.println("</body>");
          client.println("</html>");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);

    // close the connection:
    client.stop();
    if (readString.indexOf("/?DETECT") > 0) {
      Serial.println();
      Serial.println("DETECT");
      Serial.println();
      detect();
    }
    readString = "";// Clearing string for next read
    Serial.println("client disconnected");
  }
}


void printWiFiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

void detect(void) {
  distance=calculateDistance();
  delay(5);
  Serial.print("Distance:");
  Serial.print(distance);
  Serial.println(" cm");
}

int calculateDistance()
{
  digitalWrite(trigPin,LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,LOW);
  
  duration=pulseIn(echoPin,HIGH);
  distance=duration*0.034/2;
  return distance;
}

How to set the address so I can access that webpage?

https://www.arduino.cc/en/Reference/WiFiNINAConfig