你 go to youtobe go to a vid u like and look where it says ADRESS 或者 WWW.YOUTUBE.COM.and click your left button.if 你 did it right it will say cut copy paste.if it doesnt click the other button.always copy.then paste.
well, the way i do it is first go to youtobe (it doesn't seem that 你 can do this with other websites) find a video 你 like there. then under the vid it should have a button that says share click it then it should have a highlighted bunch of letters right click it then copy then click 'embed a video' back here and paste. simple.