Simplifying it.

Get your youtube link.

Delete everything aside from the random letters and numbers AFTER the =

So it shud look like.... SDfsnSJ234SDFS or something.

Then write the following...

[youtube.] [/youtube.] (However, do not include the .)

then add your copied code in betweeen....

[youtube.]SDfsnSJ234SDFS[/youtube.]

Remove the dots from that and it works, simple!

(well obviously that one wont work as i made it up, but you know what i mean