To share your screen in a Zoom meeting, follow these steps:

(1) Join or Start a Meeting:

(2) Locate and click on the Share Screen button at the bottom of the Zoom Meeting screen:

(3) Choose what to Share:

After you click on the Share Screen button a pop-up window will appear with different screen-sharing options. Could be the entire screen, a document page, an application screen, a whiteboard. Below is a document page being shared. First click on the document page and then click on Share.

(4) Zoom will indicate - You are screen sharing 

The screen being shared will have a highlighted green border.

(5) When you are done you can click on Stop Share button in red. See above.