Earlier one needed a premium Skype subscription to share screen with two or more people, but Microsoft has made it free now. What you need to do is to install latest versions of Skype on your PC or Mac,
It used to be that you had to have a subscription to Skype Premium to share screens with two or more people. Not any more. If you’ve got the latest versions of Skype for Windows desktop or Skype for Mac group screen sharing is totally free.
The video demos how to share your screen with others using Skype,