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

[Webinar2]

I have checked my settings. This feature works in meetings--But it wont allow me to check "Share sound" on videos within the webinar feature. Thanks in advance. 

[Lennie]

Are you looking under Advanced Screen Share?

[Webinar2]

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. 

[Webinar2]

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.

[Webinar2]

That would be illegal.