Sharing your desktop is just a click away. At the top of your screen click on the monitor icon to begin.
In Chrome you will install the Extension:
In Firefox you will install the Add-In:
Problems screen sharing on Firefox?
If you clicked Don't Allow when prompted to give permission for the extension, you will see this screen:
You will need to revise your permissions as shown here:
Click the X to remove the block and try again. Please choose Allow when prompted.
In Firefox you will be prompted to allow screen sharing each time as it will not save permanently.