To make a redirect within the site, go to https://puredata.info/manage and navigate to the folder where you want the redirect to be, then create a DTML Document. Set the ID and title to the same thing, and add this content to the DTML Document:

<dtml-var standard_html_header>

<dtml-let target="'THE_PAGE_TO_REDIRECT_TO'">

  <h1>This page has moved, you will now be redirected to the
  correct location.  If your browser does not redirect, click <a
  href="<dtml-var target>"><dtml-var target></a>.</h1>

  <dtml-call expr="RESPONSE.redirect(target)">

</dtml-let>

<dtml-var standard_html_footer>