Use the Flash element in Web Creator 3.

For older versions:
There is no specific tool to do this now. It can be done by pasting the code in the box used for counters (for Web Creator 2 and Presenter 5) or in a text object for older versions. Example for a Flash video:
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#3,0,0,0" width="640" height="480"> <param name="SRC" value="your_file.swf"> <embed src="your_file.swf" pluginspage="http://www.macromedia.com/shockwave/download/" type="application/x-shockwave-flash" width="640" height="480"> </embed> </object>