How to Add a YouTube Video
To add a YouTube video to your store, you need to visit the relevant video page on YouTube and find the "Embed Code". Once you have the Embed Code, you can insert it into your store while using the Text Editor (available while editing a non-product page in the Manage > Pages section or while editing a product Description). Just click on the YouTube tool and enter the Embed Code.
For more information, please see the following video help guide: