My Cute cat

@Funnycat If you edit the message, the second item from the left--it's meant to represent a movie--is what you want.

First, copy the link to your YT video.

Second, create a message/post/reply, or edit an existing one. Click on the SECOND item from the left onnthe line above your post/reply/message (the with the bold "B", italic "I", underlined "U", etc.).

This will make a pop-up appear which asks you to enter the URL of your video.

Third, paste your saved URL into the box, and hit enter.

You should see some text which shows that your video is now "embedded" in the text.

LASTLY:
When you FINISH editing your text and SAVE it you should see your video appearing just as it did for the others here.

Good luck!