A code has been added to the forum to allow YouTube videos to display inside posts.
When composing a message, paste your YouTube URL (address), highlight it, then click the
YouTube button.
The code looks like this when composing/editing:
Here is a post with a video, to see what it looks like when done:
http://www.nova4x4.org/phpBB/viewtopic.php?f=17&t=37