"The letter theeta"
Translation:το γράμμα θ
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 accent, and more.
THE GREEK ALPHABET
TIPS TO HELP YOU LEARN GREEK + HOW TO REPORT A PROBLEM https://www.duolingo.com/comment/22424028
And here is another to help you navigate Duolingo
FAQ - General Questions, Bugs & Reports >https://www.duolingo.com/comment/23799672
Some simple hints to get you started:
Always read the comments before posting.
Read the Tips & notes, on the first page of each lesson you’ll see an image of a light bulb. Click on that.
Read the drop-down hints. Pass your cursor over a word and a list of words will appear. The top word/phrase is usually the best choice.
These are the official Duolingo guidelines which you should read. https://www.duolingo.com/guidelines And these will answer lots of questions about how Duo works.
If you have questions just ask.