When you make a new thread or post (not using quick reply) click the vimeo icon (its next to the youtube one) and enter the video id or tag number.
This thread has it working:
http://www.502streetscene.net/forum/showthread.php?t=141645
If you type it out long hand (works in quick reply) the code/tag is "
This thread has it working:
http://www.502streetscene.net/forum/showthread.php?t=141645
If you type it out long hand (works in quick reply) the code/tag is "