To add a youtube video in your product description so it displays on the product detail page do the following:
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In SmithCart, go to the product setup screen and edit the product you want to add a video to
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Go to youtube.com and open the Youtube video that you would like to embed in your product description. Select & copy the entire HTML code from the "Embed HTML" box.
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In SmithCart product setup screen in the product description rich text editor click "Html View" to switch to the HTML view and paste the code you copied from the youtube site in the previous step.
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Click Update and navigate to the produuct detail page and you should now have a video playing.
Here is a link that explains it also http://joewalling.com/home/entryid/17...
Btw, the SmithCart product setup screen description uses the same DNN rich text editor as the regaular DNN html module so you have all the capabilities for adding content and media that the DNN html module provides. If you google "How to add a youtube video to DNN html module you will find alot of good articles and videos on how to do it.
Hope this helps!