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"The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it." - Michelangelo.
Go to youtube, find the video you want, copy the url, return to MoFo, click reply and then click the youtube icon on your screen, then paste the url inbetween the brackets. Or, alternatively, you can type out the BBC Code for youtube. Basically it will look like this (without the spaces):
[ YOUTUBE ] Paste YouTube URL Here [ /YOUTUBE ]
Now you know.
You can also edit your previous post and add in the code and url for the video.