Hang an iframe on a subdomain

Need to understand existing code, website Skidka-plus.com
Previously was a functional Showcase(iframe), it hung webmasters who have a website
On another website, I insert the Iframe code ...
There is functionality in the admin site settings in Windows, but the iframe has no need to understand what it was
or to look in the code I also have assumptions
after that post on sub-domain vitrina.skidka-plus.com
Site slopes php