Throw 3 darts at the current target.
Press the buttons for the darts you hit and press "Register hits" buttons to track your darts.
You need to hit the target with at least 2 darts to continue to next target.
Beginner mode only needs 1 hit for next target.
When you hit the target with your 3rd dart and then with the 1st dart on your next throw you're good to go for the next target.