Go to YouTube Find your vid Hold down leftt button/bar at start of address line. Pass to the right, holding down button to highlight address. Right click. Choose 'Copy' Go to not 606 thraed to post. On top line (where Smileys are) is a 'film clip' Clickon that. Put cursor in box. Right click and 'Paste' Embed Post.
The problem here is that very few videos actually show the address line (on an iPad, at least), so a much more devious process is needed.