I usually pop into the Game Everyone Loves To Play or AMV forum and hit "reply" on the nearest convenient post to copy and paste, since my memory is kinda bad, but it's actually quite simple. Just take out the line breaks:
[
video=youtube]
http://your.url/here
[
/video]
[
video=youtube]
http://your.url/here
[
/video]
--
‎noli esse culus
‎noli esse culus