Can't enable "share sound" in webinars! Help! Webinar is tomorrow!!!

Are you looking under Advanced Screen Share?

The screen share button will not allow me to select it. The normal "share sound" options are not under the 'more' tab on the zoom toolbar. 

I also only have a video link from youtube. It costs money to download, therefore we cannot record and post the video after the webinar.

That would be illegal.

Yes I have the same issue, it's fine in meetings but in webinars it's disabled!