How do I get embed to work in the upfront HTML?

How do I get embed to work in the upfront HTML?

When I put in:
<iframe src="http://www.finn.no/pw/search/car-norway?orgId=788348956"
width="100%" height="700" frameborder="0" scrolling="auto" />

On this pages:
https://www.listerbobil.no/nye/
I do not work... see: http://screencast.com/t/yrtBAtnptd

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When I save the code disappear