Step 1: 

Click on the zoom link in the email 

Step 2:

Select the appropriate audio

Step 3:

At the bottom toolbar, click on the Share Screen button 

Step 4:

Select the screen you want to share

Click the Share button 

The screen will have a green border when you are sharing (A)

The toolbar will also note 'You are screen sharing' (B)

To stop sharing, locate the toolbar and click on the Stop Share button 

You should have received an email