'Set video url field in basic settings tab.
Arguments:
url (str): video url
field_number (int): video url field number'

def set_url_field(self, url, field_number):

    if (self.q(css=CLASS_SELECTORS['collapse_bar']).visible is False):
        self.click_button('collapse_link')
    self.q(css=CLASS_SELECTORS['url_inputs']).nth((field_number - 1)).fill(url)
    time.sleep(DELAY)
    self.wait_for_ajax()
