Hi,
Just type in Betacode. After publishing the lesson, it will be re-presented to you in Greek (assuming you have Unicode font configured to your browser). If you are not seeing this, please let me know.
Do not use any Textkit-specific tags, e.g., no [face=], etc.
If you really want to type in Greek, you need keyboard mapping software like Tavultesoft’s Keyman.
See my last reply to Diane in http://discourse.textkit.com/t/testing-fonts/3960/1
Cordially,
Paul