Accidentals can be set, or changed by dragging an accidental symbol from the accidental palette to a note in the score.
If you only want to change the pitch of a note, you can also select the note and press:
- ↑: Increase the pitch of a note by one semitone (favors sharps).
- ↓: Decrease the pitch of a note by one semitone (favors flats).
- Ctrl+↑: Increase the pitch of a note by one octave.
- Ctrl+↓: Decrease the pitch of a note by one octave.
You can change an existing accidental into a cautionary accidental (enclosed in parentheses), drag the parentheses from the accidental palette onto to the existing accidental (not the note head). To remove parentheses, select the accidental and press Del.
If you later change the pitch with cursor keys, manual settings to the accidental are removed.
The menu function Notes → Pitch spell tries to guess the right accidentals for the whole score.