Enter the Windows address reachable from Puppetmaster and your Windows account password, not a PIN. Then paste the setup code into the installed helper; it enables Remote Desktop automatically.
Install the matching Ubuntu/Debian .deb from Downloads, then open Puppetmaster Helper from your desktop’s application menu and paste the setup code. It installs the required components and shares your existing desktop. Keep that desktop signed in for screen control. Terminal and file access are included.