How to insert not link, whole "webform" form into the page node?

Edit the node, under the "Webform advanced settings" check the option for "Show complete form on teaser"

But how does one insert the webpage in the node using that option? Am I missing something?

I actually want to do it in Drupal 5.7 with the Webform v5.20.

Thanks.

See #248157: Allow any Webform to be displayed as a block.