1. Place your first finger on the fret of the note you want to trill.
2. Place your second finger on the fret above the note you want to trill.
3. Quickly alternate between the two fingers, using a light touch.
4. The speed of the trill can be varied by adjusting the distance between the two fingers.
5. Practice trills regularly to improve your technique and control.
Here are some additional tips for trilling on guitar:
* Keep your fingers relaxed and close to the fretboard.
* Use a consistent motion when alternating between fingers.
* Don't press too hard on the frets, as this can make the trill sound muddy.
* Experiment with different fingerings to find the one that works best for you.
* Practice trills on different strings and in different positions on the fretboard.
* Listen carefully to the sound of the trill and adjust your technique as needed.
With practice, you can develop a beautiful and expressive trill technique that will add a new level of interest to your playing.