It is about to giving answers on questions Nootka asks.
A question can be a note on the score to give its name as an answer or the question may be entire melody on the score and user to answer on such a question has to play it on his real instrument. All depends on selected level, so to start practice with Nootka, first of all user needs to select one of them.
Then start an exercise or an exam on the selected level, alternatively select the previous exam to continue.