Iframe can be added to any "general" as follows:

  1. Create the page
  2. Edit Page Optoins and set the width to Full-width
  3. Add rich content widget
  4. open the HTML
  5. add the iframe script using the following generic formatL  <iframe src="http://iframes.ovnight.com/engagement-rings/halo/round" style="height: 500px; width: 100%; border: none;"></iframe>

Add an iFrame to a local brand page as follows:
  1. Ensure the retailer is removed from any access policies for the brands you're setting up locally (iframes/scripts/whatever). 
  2. Log into the retailer's site admin
  3. Go to Catalog > Brands
  4. Create a new brand, set brand to Profile (not catalog)
  5. The required fields for setting up a local brand where you'll be adding an iframe/script are only (everything else is otherwise irrelevant):
    Name (spell it right!), Slug (auto-populates), Logo (save from the portal), & the IFrame field of course. You can put scripts in here too! If you get a script with a div tag (as all the OPT scripts have come so far), put the div tag directly after the script. Ie, "<script type="text/javascript" charset="utf-8" src="https://abcs.optcentral.com/js/abc.min.js?rid=4f91cceb6245182339000000"></script><div class="opt_abc" id="_basha"></div>.
  6. Save.