1. Open GarageBand on your device.
2. Select the "New Project" option and choose the "Software Instrument" template.
3. In the instrument selection menu, choose the "Piano" or "Grand Piano" instrument.
4. Once the piano is loaded, you will see a virtual piano keyboard on the screen.
5. To play the first note of "Ode to Joy," tap the "C4" key on the virtual keyboard.
6. Continue playing the following notes in the melody: "D#4-E4-F#4-G4-A4-G4-F#4-E4-D#4-C#4-D#4-C#4-B3".
7. Repeat the same pattern of notes an octave lower, starting with the "C3" key.
8. Play the notes "A2-G2-F#2-E2-F#2-G2-A2-G2-F#2-E2-D#2-E2-D#2-C#2"
9. Play the chords "C major-E minor-F major-G major" in a rhythmic pattern.
10. Finally, play the notes "C4-D#4-E4-F#4-G4-A4-G4-F#4-E4-D#4-C#4-D#4-C#4-B3" to complete the melody.
Remember to adjust the tempo and dynamics to your liking, and experiment with different variations and embellishments to add your own personal touch.