How to Make Videos Fullscreen(without software)- Yt:stretch=16:9

I was watching last weeks vids and noticed that a good 1/4 of them aren't fullscreen, and i just had to make a vid about it! Heres a little trick to stretch ur aspect ratio to 16:9 to make the video fullscreen. 1) Go to the video you want to make fullscreen, edit and scroll down to the tags 2) Make sure theres a space after the last tag, if there are any, and type everything inbetween these quotation marks "yt:stretch=16:9" 3) After ur done, make sure everything exact, or it will not work, and hit save detail at the top 4)Wait a few seconds before refreshing and then go to the video and enjoy :) Also, u can type in "yt:quality=high" to increase the default playback quality, have fun kids! Ill find the sony vegas link later. If u still dont understand, i will put it in MY tags so u can see exactly how its done.