Worry not - you're just a few clicks away from recording your first Desktop test.
Click "Share Screen"
When a window pops you'll notice that the "Share" button is greyed out and inaccessible.
Just select the the image of your desktop Screen - this will allow you to click the click the "Share" button and proceed.
If your participant is using MacOS and is still unable to share a screen, please have them ensure that their permissions are set up correctly. We explain how to do that here: https://help.lookback.io/en/articles/3422267-i-can-t-start-a-desktop-test-because-i-can-t-set-up-the-mic-camera-screen-recording-on-my-mac
Note: "Sharing Screen" is necessary for the Researcher to view how you interact with their product and watch how you carry out the specified tasks. "Sharing Screen" only allows the Researcher to see and record your entire screen. This does not allow them control your screen.
But if there's a program on your screen that is confidential, make sure to close it first, before sharing your screen with the Researcher.