wifi shiel not present cannot connect to internet

Hi everybody, im starting in the arduino`s world

I bought this shield Loading...
and i cant connect to internet

when i scan de net using the tutorial from https://www.arduino.cc/en/Guide/ArduinoWiFiShield, i have this:

"Initializing Wifi…
MAC: 0:0:0:0:0:0
Scanning available networks…
** Scan Networks **
"

when i try this code, i have this answer “wifi shield not present”

/*
Web client

This sketch connects to a website (http://www.google.com)
using a WiFi shield.

This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.

This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.

Circuit:

  • WiFi shield attached

created 13 July 2010
by dlf (Metodo2 srl)
modified 31 May 2012
by Tom Igoe
*/

#include <SPI.h>
#include <WiFi.h>

char ssid = “yourNetwork”; // your network SSID (name)
char pass = “secretPassword”; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
// if you don’t want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server = “www.google.com”; // name address for Google (using DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;

void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}

// disable SD SPI
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);

// 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);
}
Serial.println(“Connected to wifi”);
printWifiStatus();

Serial.println("\nStarting connection to server…");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println(“connected to server”);
// Make a HTTP request:
client.println(“GET /search?q=arduino HTTP/1.1”);
client.println(“Host: www.google.com”);
client.println(“Connection: close”);
client.println();
}
else {
Serial.println(“connection failed”);
while(true);
}
}

void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
while (client.available()) {
char c = client.read();
Serial.write(c);
}

// if the server’s disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println(“disconnecting from server.”);
client.stop();

// do nothing forevermore:
while(true);
}
}

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");
}

How can i connect the arduino uno with the shield to internet?

thanks a lot