Tap inside the box above to activate (or deactivate) the keyboard, and use the buttons that appear to enter text. Pressing (and releasing) a single button will produce the primary letters (A, S, E, T, N, I, O, and P). All other letters are obtained by pressing a chord (two primary letters at the same time). To learn the chords, look for the letter in the button header, press and hold the button, and find its matching component. For example, to type the letter Q, press and hold your left pinky, then press your right index finger, then release both. Pressing both thumbs at the same time will clear the screen. Once you have memorized some of the chords, you can try the invisible version (though you may want to try the tutorial first).