string kullaniciAdi = textBox1.Text;
            string sifre = textBox2.Text;

            // WebDriver'ı başlat
            ChromeOptions options = new ChromeOptions();
            options.AddArguments("--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3");

            IWebDriver driver = new ChromeDriver(options);


            // Implicit Wait
            driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);

            // Letgo.com'a git ve sayfanın yüklenmesini bekle
            driver.Navigate().GoToUrl("https://www.letgo.com/");
            WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
            wait.Until(ExpectedConditions.UrlContains("letgo.com"));

            // Oturum açma sayfasına gidin
            IWebElement loginLink = driver.FindElement(By.XPath("/html/body/div[1]/div/header/div/div/div[3]/button"));
            loginLink.Click();

            // "E-posta adresiyle devam et" butonuna tıkla
            IWebElement continueWithEmailButton = driver.FindElement(By.CssSelector("[data-aut-id=emailLogin]"));
            continueWithEmailButton.Click();

            // Kullanıcı adı alanına veri gir
            IWebElement emailField = driver.FindElement(By.CssSelector("#email_input_field"));

            Random random = new Random();
            foreach (char c in kullaniciAdi)
            {
                System.Threading.Thread.Sleep(random.Next(0001, 1000));
                System.Windows.Forms.SendKeys.SendWait(c.ToString());
            }