Click on the media button when editing your discussion (it's right next to the the image one) and paste the embed code from Youtube in there. You can get the embed code by going to the video on Youtube, right-clicking on it, and selecting the option that appears.
Click on the media button when editing your discussion (it's right next to the the image one) and paste the embed code from Youtube in there. You can get the embed code by going to the video on Youtube, right-clicking on it, and selecting the option that appears.