Need help changing sketch please

Hi folks can anyone help me please i am very new to arduino, i have found a sketch that works perfect for me but want to change where it says LED i want to put something like living room light and when the box is checked the relay is off and should be on i think lol
thanks pete.heres the sketch

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0d, 0x21, 0xe3 };    // MAC address
IPAddress ip(192,168,1,89);                               // IP address

EthernetServer server(80);

char char_in = 0;    // used to store a character from the Ethernet port
String HTTP_req;     // stores the received HTTP request

const byte LED_pins[] = {2, 3, 5, 6, 9};          // Arduino pins used as ouputs for LEDs
byte LED[sizeof(LED_pins)] = {0};        // the state of each LED

void setup()
    Ethernet.begin(mac, ip);
    // set up the LED pins as outputs
    for (byte index = 0; index < sizeof(LED_pins); index++) {
        pinMode(LED_pins[index], OUTPUT);

void loop()
    EthernetClient client = server.available();

    if (client) {
        while (client.connected()) {
            if (client.available()) {
                char_in =;  // get a single character from the Ethernet port
                HTTP_req += char_in;      // build a string out of the received characters

                // answer first HTTP request immediately
                if (char_in == '\n') {
                    // respond to HTTP request
                    client.println("HTTP/1.1 200 OK");
                    client.println("Content-Type: text/html");
                    CheckLEDs();              // get state of LED checkboxes from web page
                    DisplayLEDs(&client);     // display checkboxes on web & write to LEDs
                    HTTP_req = "";      // delete string contents
                } // end if (char_in == '\n')
            } // end if (client.available()
        } // end while (client.connected())
    } // end if (client)

// get the state of the LED checkboxes from the HTTP request
void CheckLEDs()
    for (byte led_num = 0; led_num < sizeof(LED_pins); led_num++) {
        if ((HTTP_req.charAt(9) == (LED_pins[led_num] + '0')) &&
                    (HTTP_req.charAt(16) == (LED_pins[led_num] + '0'))) {  // LED box is checked
            LED[led_num] = 1;
        else if (HTTP_req.charAt(9) == (LED_pins[led_num] + '0')) {        // LED box is unchecked
            LED[led_num] = 0;

// write the HTML that includes the state of the LED checkboxes for displaying on the web browser
void DisplayLEDs(Client *client)
    // some CSS in the HTML to change colours and position of the box containing the LED checkboxes
    client->print("<div style=\"background:white; color:green; position: absolute; margin:20px; border: grey solid 2px; padding:0 10px 4px 10px;\">");
    client->print("<h1 style=\"font: normal 20px/150% Verdana, Arial, Sans-serif;\">Lights Outputs</h1>");
    // send each LED checkbox in turn
    for (byte led_num = 0; led_num < sizeof(LED_pins); led_num++) {
        // use hidden checkbox so that unchecking a checkbox sends a value to the Arduino
        // if only a normal checkbox is used, nothing is sent when it is unchecked
        // both hidden and normal checkboxes are produced here for each LED
        client->print("<form> <input type=\"hidden\" name=\"Led");
        client->print(LED_pins[led_num], DEC);
        client->print("\" value=\"0\"> <input type=\"checkbox\" name=\"Led");
        client->print(LED_pins[led_num], DEC);
        client->print("\" value=\"");
        client->print(LED_pins[led_num], DEC);
        // write to the LED connected to the Arduino board
        if (LED[led_num]) {
            client->print(" checked ");             // part of HTML if checkbox is to be displayed checked
            digitalWrite(LED_pins[led_num], HIGH);  // switch LED on
        else {
            digitalWrite(LED_pins[led_num], LOW);  // switch LED off
        client->print(" onclick=\"submit();\">LED");
        client->print(LED_pins[led_num], DEC);
        client->print(" </form>");                 // end of HTML for 1 LED's form
    client->print("</div>");                       // end of box containing LEDs

Before you get help, you need to read this.

Thanks will do

The worst thing that you have in your post is that you don't have the code inside the "code" tag. Edit your post, select your code and press the button with the '#' in the toolbar, and then save.

Thanks very much luisilva

but want to change where it says LED i want to put something like living room light and when the box is checked the relay is off and should be on i think lol

So what's stopping you?

I'm very bad ]:slight_smile: but we need to follow the rules. It's mush more easy to read the code if it's like it was now.

Now, you can solve the problem by changing... nothing!
If you need to turn on "living room light" you need one relay (ore more if you want more than one light). The Arduino is able to turn on and off a LED, but a light is too mush to him. So it need a help that is done by a relay.
Here is one example of one shield with a relay. There are many more with different number of relay and of many brands and of course with many prices.