code: def fill_form_field(self, field_name, field_value):
          
          self.browser.execute_script(
              "document.getElementsByName(\"" + str(
                  field_name) + "\")[0].value = \"" + str(field_value) + "\"")
docs: Fills given field with given value
  
          :param field_name: name of field to fill
          :param field_value: value with which to fill field