This video goes through the process of changing some of the properties of a form with the hook_form_alter() function. This hook is a very powerful tool to be able to modify existing Drupal forms, created by core or contributed modules, and tailor them to your needs.
Check your version
This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.