The information in this article applies to:
HELM Control Panel
DETAILS
When your site is initially set up though the Helm control panel, a temporary holding or "parking page" is automatically created that has an under construction sign and some simple welcome text. This is so anyone who visits your page won't get greeted with an error page. You can modify this page as you see fit.
Once you're ready to upload your website, just delete the _holding.htm page and replace it with your own default document.