The IFrames interface comprises 3 tabbed areas - File, Advanced and Options.

IFrame interface

File

Set the most common attributes for the iframe including URL, Alignment and Dimensions. See Creating an editing iframes

The URL for a local file can be selected using the File Browser icon at the end of the URL field.

Advanced

Set advanced attributes for the iframe. See Advanced Options

Options

Set options specific to Youtube, Vimeo and Dailymotion iframes. See IFrame Options