"He is my friend."
Translation:Він - мій друг.
If you mean the English transliteration of the Ukrainian word, unfortunately I don't know. I tried "Vin" and "win", "drug" and "druh", "mii" and "mij" and "mi" and none of the combinations is accepted, most say "You have a typo".
Sadly there is no table or description of the transliteration rules on the Wiki for the developers of the course, so as a new person here I cannot learn it in any way and can't help you :'(