HELP! Sending commands from website in SD card to arduino.

Hi! My name is Renato and I am an apprentice with regards to the Arduino. I have this project that I am doing for school which requires me to have a website that can send commands to the arduino board to have its motor spin. I m having a problem figuring out how I can have a function or something on this website code to call into the arduino code to make the motor move. How do I communicate from the website in the SD. card and the Arduino code outside of it? I just want to have a function that moves the motor when the alarm on the website sounds. As in this snippet of the website:

 if (typeof this.hourwake!="undefined"){ //if alarm is set
                        if (this.ctref.title==(this.hourwake+":"+this.minutewake+":"+this.secondwake)){
                                clearInterval(jsalarm.timer)
                                countdowntimer()
                        }
                }

Heres the code. The website that is on the SD card can be accessed through this website:www.itcup.skuttcatholic.com. So you can just inspect the source on this website to see the code of it.

Here is the code on the arduino. It simply reads the SD Card:

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

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0x01, 0xE8 };
IPAddress ip(192,168,0,38);// IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80

File webFile;

void setup()
{
    Ethernet.begin(mac, ip);  // initialize Ethernet device
    server.begin();           // start to listen for clients
    Serial.begin(9600);       // for debugging
    pinMode(9,OUTPUT);
    
    // initialize SD card
    Serial.println("Initializing SD card...");
    if (!SD.begin(4)) {
        Serial.println("ERROR - SD card initialization failed!");
        return;    // init failed
    }
    Serial.println("SUCCESS - SD card initialized.");
    // check for index.htm file
    if (!SD.exists("index.htm")) {
        Serial.println("ERROR - Can't find index.htm file!");
        return;  // can't find index file
    }
    Serial.println("SUCCESS - Found index.htm file.");
}

void loop()
{
    EthernetClient client = server.available();  // try to get client

    if (client) {  // got client?
        boolean currentLineIsBlank = true;
        while (client.connected()) {
            if (client.available()) {   // client data available to read
                char c = client.read(); // read 1 byte (character) from client
                // last line of client request is blank and ends with \n
                // respond to client only after last line received
                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");
                    client.println();
                    // send web page
                    webFile = SD.open("index.htm");        // open web page file
                    if (webFile) {
                        while(webFile.available()) {
                            client.write(webFile.read()); // send web page to client
                        }
                        webFile.close();
                    }
                    break;
                }
                // every line of text received from the client ends with \r\n
                if (c == '\n') {
                    // last character on line of received text
                    // starting new line with next character read
                    currentLineIsBlank = true;
                } 
                else if (c != '\r') {
                    // a text character was received from client
                    currentLineIsBlank = false;
                }
            } // end if (client.available())
        } // end while (client.connected())
        delay(1);      // give the web browser time to receive the data
        client.stop(); // close the connection
    } // end if (client)
}