Bring up the video on youtube and right click on the video and it should bring up a drop down screen and the top selection is "copy video URL " click on it then go to the reply box here and on the tool bar up top there are 3 dots with a down arrow (insert) click on it and it will bring up a drop down screen and the top one is " media " click on it and it will bring up a insert media box hold down the control button and hit v and it will insert your video. It will show the url in your response so hit the preview and it should show the video no the link, hope this helps.