The test can be started at any moment from the webinar dashboard by clicking on "Test the webinar". Click on the screen share icon under the video to share your screen.
Click here for more information on screen sharing.
To be able to use screen share functionalities, you have to install a Chrome extension once.
Google Chrome version 72 and up no longer require an extension to share your screen.
You can identify the version of your Chrome software by clicking on the 3 dots in the top right of your browser and choose "Help" > "About Google Chrome".