Hi Om I was getting to you but the Internet is soooo slow at my place today! Just to make you feel better I had to ask too the first time and it is dead easy!
Open two tabs/screens on your computer. one should be utube and one soft Mozart. Open a new thread in the recital section of soft Mozart. Then flick over to your you tube page. Click on the video you want to load ( as if you are going to play it) up the top of your screen, select and highlight the entire browser address for that video. Copy it. Go back to soft Mozart and paste it into your thread. It will show up as a highlighted line of letters but when you post it to the forum you will be able to see the video preview. To press like I think people will need to view it in utube so post a link to your channel at utube too. Actually, just type the word "like" under their thread I am sure Helene will Count that too!