To add an Iframe to a Page, navigate to:
  1. onMessage > Website > Site Name
  2. Click the Editing Wrench icon and click Edit Page Content  of a existing page, or create a new page
  3. Drag the IFrame content type from the left hand side onto the area of the page you are looking to display this on
  4. Enter the URL of the Iframe
  5. Enter a Height of 2000 (you can adjust this number if its too large or too small as needed) after you preview the live page 
  6. Click Save
  7. Click Apply Changes on the page
  8. View the Page on the Live public site, not the View Page option while editing in onMessage as this may not display the content at all behind the password