heres how i do it most times Kalamity... i go to this link:

http://www.youtube.com/browse?s=mp&t=t&c=10&l=

i search for the song and click on the vid box next to its title....

that will load the vid in the same browser window....

to the right is a box titled 'embed' ..

left click inside that box so it is highlighted, then, right click and choose copy

go back to PC (it helps to use multiple tabs, but nnot required) and open 'new post' in Videos ....

click the cursor in the message box and then right click and choose 'paste'

that should do it... hope that helps ... : )