you look for any video you want in your profile..then down the video it's a bottom "share", you click there and there's going to appear like this: http://youtu.be/4whzrqeoU0A for example...then you go to your witty, click on edit profile, then source and you paste this there..and thats it(:
HAHAHAHAHAHA, girls you are SUCH a funny girls!! i loooved your videos, i just saw the proactive commercial parody and domino hahaha, wow, you rockk! keep doing videos!(: