How to use

FindElement

method

in

org.openqa.selenium.firefox.FirefoxDriver

 FirefoxDriver _driver = new FirefoxDriver();

// create webdriverwait
WebDriverWait wait = new WebDriverWait(_driver, TimeSpan.FromSeconds(10));

// create flag/checker
bool result = false;

// wait for the element.
IWebElement elem = wait.Until(x => x.FindElement(By.Id("Element_ID")));

do
{
  try
  {
    // let the driver look for the element again.
    elem = _driver.FindElement(By.Id("Element_ID"));

    // do your actions.
    elem.SendKeys("text");

    // it will throw an exception if the element is not in the dom or not
    // found but if it didn't, our result will be changed to true.
    result = !result;
  }
  catch (Exception) { }
} while (result != true); // this will continue to look for the element until
             // it ends throwing exception.