I can't seem to do it. I used the icons to wrap the text, but the video still didn't show
then, when I tried to edit, the icons disappeared
Are you trying to post youtube or Vimeo?
Either way, paste the video code (with YT it's the code after watch?v=, and with vimeo it's just the number in the URL.) then select it and press the button for vimeo, youtube or whatever. this will add the tags for you.
> [VIMEO ]57717709[/VIMEO]
result without spaces is this: