To embed the vid, click on the YouTube thingy
That'll give you this
You then copy the part of the youtube address after the = sign, in the case of your puddytat video it is "v-JXBiiV51Q", and paste that
between the bracketed words.
It would look like [Y O U T U B E]yourvideocodehere[/Y O U T U B E]
And you would get this: