Wonderful song Laura and a very warm welcome to the best forum around
If you want to embed YouTube videos so they play in this forum copy then whole address from the top bar and paste it into a reply box.
Then delete everything before the actual address, so everything at the beginning up to and including v=
There may be a & and some other stuff you don't need after the address so delete that too.
Then click the YouTube icon at the top of the reply box. This will give you after the address.
Cut and paste [youtube] at the front of the address and post it.
So basically you are enclosing the address with [youtube] tags.
Hope this is clear. All the best, John