Embed Website Within Hosted iFrame

In the App Settings add the following to one of the textboxes (i.e. Main Content): 

<iframe src="https://YOUR_SITE_URL" scrolling="no" width="810px" height="1000px" />

You can replace YOUR_SITE_URL with the full url to the content you want to use. Like you mentioned, you will want the URL to be https because FB is moving to all SSL soon. The other thing you will need to edit is the height, so that you page does not get cut off.

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