A video in the video directory is actually quite simple. Choose this in the sidebar category and click on it. Then over / under of the video list button to add new videos. () After clicking on this button you go to a page to enter a video. There you have 2 options:
Of course there is also the possibility to comment on a video Available.
Simply click on the video that you want to comment, and scroll to the bottom of the page. There you find the box "comment on this video." Write in this, your comment and then click on "Save comment" - Ready!
Look Out!: You should wait till after the video is over to comment or the video will restart.