آپ go to youtube go to a vid u like and look where it says ADRESS یا WWW.YOUTUBE.COM.and click your left button.if آپ 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 youtube (it doesn't seem that آپ can do this with other websites) find a video آپ 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.
here's a random vid that i embed just to دکھائیں it works.