Simple

Right above the smileys this one ----> theres a button that says 'YouTube' your gonna click that and this will appear.

[youtube=425.350] [youtube]

from here all you gotta do is copy & paste the YouTube link right in between it

[youtube=425.350]right here[youtube]

then you delete EVERYTHING thats to the LEFT of the equals sign = including the = sign.

For example heres the link by itself: http://www.youtube.com/watch?v=X316qCj_ynY

*Note I'm gonna purposely embed the videos wrong so that you can visibly see what I mean

This is what it would look like at first: [youtube=425.350] http://www.youtube.com/watch?v=X316qCj_ynY [youtube]

From here just delete everything from the link thats to the left of the <------- = sing including the = sign
So you rlink will look like this now


[youtube=425.350]X316qCj_ynY [youtube]