1. Hold the flute correctly. The flute should be held horizontally, with the right hand closest to the mouthpiece. The left hand should be placed below the right hand, with the thumb covering the hole closest to the mouthpiece.
2. Blow into the mouthpiece. The air from your breath should be directed across the edge of the mouthpiece, creating a sound.
3. Cover and uncover the holes to produce different notes. The five holes on the flute correspond to different notes in the scale. By covering and uncovering the holes, you can create different melodies.
4. Practice the melody of Green Sleeves. The melody of Green Sleeves is as follows:
```
G - A - G - F# - E - D - C# - B - C# - D - E - F#
G - A - G - F# - E - D - C# - B - A - G - F# - G
```
5. Play the song. Once you have practiced the melody, you can play the song by blowing into the mouthpiece and covering and uncovering the holes in the correct sequence.