To succesfully post a video in an RP, make sure you go to reply...NOT QUICK REPLY, and use the following code(s)
FOR YOUTUBE:
example:
[ flash(height, width)] youtube link [/flash]
FOR DAILYMOTION:
[ flash(height, width)] dailymotin link [/flash]
FOR FLASH VIDEOS:
Click the flash icon in the reply section... right under italicize