Which site builder are you actually using to insert video? Knowing which builder you're trying to use could help other members familiar with the application offer more specific advise on how to insert the video you want.
The site builder aside, there's some general information available through your preferred search engine that might help. I found one general article at W3Schools.org that might be able help you get started.
Let us know if you manage to get this worked out on your own.
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