‘Flashcards’ are in the ‘REVIEW’ tab.
There’s a nice big deer icon so they’re hard to miss (OK, maybe not that hard to miss if you’re reading this…)
Click on the big circle with the antlered deer to see the Flashcards you’ve accumulated through your lessons so far.
How well do you know the words/sentences on each flashcard? When you check your answer, you’ll be prompted to mark the card as “weak”, “good” or “perfect”. This feeds into the custom settings for the ‘Vocabulary’ and ‘Grammar’ sections — if you choose the ‘Weak only’ option for these exercises, you’ll only be tested on new vocab and grammar, and the knowledge points you’ve marked as “weak” (or that have been marked through your lessons as “weak”).