If the account and email you list match up with what's on the old site, you'll receive a password reset email, and all your data (comments, etc.) will be migrated within a couple days.
Copy/paste the following text into your website to embed.
<iframe width="640" height="360" src="http://www.youtube.com/embed/zllR36VD78o" frameborder="0" allowfullscreen></iframe>
Comments