Go to Youtube, find the video you want, and highlight it's embedded tag. Click copy. Go to your hub and click the edit mode. Scroll down and find the video link on the right. Click that and it will open a video capsule at the bottom of the page. Paste the embedded link in it and click save.
That should do it. BTW, preview this before closing. If the video is not located on the page where you want it to be, you can reorder the list of capsules which is also on the right. Be sure that after dragging and dropping the capsules into the order you want, that you click the reorder button.