Polytonic Greek on Windows 10

Greek Learning Greek
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Polytonic Greek on Windows 10

Downloaded the installed Greek Polytonic Keyboard and pinned the Keyboard Viewer to the taskbar. All the breathing and stress marks are there. However, how do I combine the letters and marks?

Any help gratefully received.

2

Now sorted thanks to YouTube.

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Forgot to add the link in case someone else is interested: https://youtu.be/Pybm6z1fjV0?list=PL7Sclx2uCd12R2yTyISaZSeDGoBYKV4C7