SHOWING AN EXERPT FROM A VIDEO BY SHARING SCREEN WHEN ON ZOOM

I was teaching a class and wanted to show a short youtube (or otherwise) video using share screen. The students were unable to see or hear it. I should be able to do this, but don't know the steps. Can anyone help? I'm a 1, 2, 3 type of thinker as in.

1. Do...

2. Do...

3 Do...

I am very grateful for help with this.