Press play: the dot moves the way a conductor's hand does, landing on each beat, and the number counts the beats. Beat 1 is always the downward stroke.
Tap on every beat. Beat 1 of each bar is the strong one.
A short tune plays without its score. Which meter is it in?
Start listening, then press play and sing your part: your voice is the line, gilt when in tune, red when off. Stopped, it works as a tuner and names the note you sing. Use headphones, so the microphone hears only you.