how to insert a youtube video in osu forum
[youtube]VIDEO_ID[/youtube]
The [youtube] tag is used to embed a YouTube video on the website. The tag requires the user to input only the video ID (not the entire URL) between the two tags (represented by the VIDEO_ID argument above).
A YouTube video's ID is located in the URL of the video, and is the string of 11 characters directly after the v=.