This and much more is explained in the Tips & notes. See here for how to access them and other helpful information.
TIPS TO MAKE LEARNING EASIER + HOW TO REPORT A PROBLEM
This is the Greek Forum with more information.
If you have any questions just ask.
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HOW TO GET THE GREEK KEYBOARD These links will not only show you
how to get the Greek keyboard but also
how to find the Greek letters on it,
how to add accents etc.
It will also help you learn the alphabet and where to find other help.
And here are
TIPS TO HELP YOU LEARN + HOW TO REPORT A PROBLEM https://www.duolingo.com/comment/22424028
You are at the beginning of the course and we are giving you some words to help you understand what the Greek letters look and sound like.
Here we give you a simple English word "fact" and the Greek word meaning the same thing "γεγονός".
See here for help learning on Duolingo
TIPS TO HELP YOU LEARN + HOW TO REPORT A PROBLEM
And check out the Greek Forum here with more links.
https://forum.duolingo.com/topic/936 Here you will find links to help you access your Greek keyboard, learn how to find the letters on it and much more.