code: def sign_up(self):
          
          try:
              self.driver.get(self.URL)
              logger.info("Loaded ad page.")
              begin = WebDriverWait(self.driver, 10).until(
                  EC.element_to_be_clickable((By.CLASS_NAME, "btn-primary"))
              )
              begin.click()
              logger.info("Clicked begin experiment button.")
              WebDriverWait(self.driver, 10).until(lambda d: len(d.window_handles) == 2)
              self.driver.switch_to_window(self.driver.window_handles[-1])
              self.driver.set_window_size(1024, 768)
              logger.info("Switched to experiment popup.")
              consent = WebDriverWait(self.driver, 10).until(
                  EC.element_to_be_clickable((By.ID, "consent"))
              )
              consent.click()
              logger.info("Clicked consent button.")
              participate = WebDriverWait(self.driver, 10).until(
                  EC.element_to_be_clickable((By.CLASS_NAME, "btn-success"))
              )
              participate.click()
              logger.info("Clicked start button.")
              return True
          except TimeoutException:
              logger.error("Error during experiment sign up.")
              return False
docs: Accept HIT, give consent and start experiment.
  
          This uses Selenium to click through buttons on the ad,
          consent, and instruction pages.