How to embedded Youtube video into Discussion topics?

I've saw some topic that they could embedded the Youtube video but can't figure out how. I'd be appreciated for any help. Thanks

 NoirRoseHeart:

When replying to a forum, there is a blank space in between the spoiler button and the redo button, that is where you click to embed a video. There used to be a video icon there, but it disappeared years ago and hasn't been fixed yet, so it's easy to not know anything is there.

Thank you for your help. I've tried but it kept show "Something went wrong" is there any required format for the link or any error at the moment?

 kelvin:

I've tried but it kept show "Something went wrong"

It's buggy at the moment so it's not you. You just have to keep trying several times until it got thru.