How to embed Youtube Videos in Forum Posts?

[Grundkurs]

Hello There!
I cant figure out how to embed a youtube-video into a forum post.
For example:
i tried [YT]QiSgmamUSVw[/YT]
or [youtube: QiSgmamUSVw]
or [youtube]https://www.youtube.com/watch?v=QiSgmamUSVw[/youtube]
or [youtube]QiSgmamUSVw[/youtube]

but non of it works in the preview. However i saw multiple forum posts with embeded youtube videos. What did i miss?
Greetings

[Laurent]

Just post the link, without any surrounding tag. The trick is to use the HTTP URL, not HTTPS.

[Grundkurs]

ommitting the "s" in http did the trick, thanks a lot!