1. Open the Session-Link 
2. If you do not have installed VSC, you can join via WebBrowser. But VSC is recommended, Please download it here: https://code.visualstudio.com/Download
3. Join the Live-Session
4. You will be redirected to VSC and a plugin will be installed.
5. After plugin was install, please re-join the session. You'll be asked for Login/Sing In.
6. If you'll be asked for entering the Session-Link. Use the above. 
That's it! Enjoy the Live-Session