How can I change the pitch of a note?
Notation Composer allows you to change the pitch of notes by selecting them (simply left-clicking on the note(s) you want to change), and then using the up/down arrow keys to move the note(s) to the desired pitch in half-step increments, or use Page Up/Down to move them by an octave. Or you can "mouse drag" the note to it's desired pitch.
Notation Musician does not support changing the pitches of notes.
For further information on editing the performance of notes, please see the User's Guide in the topic "Editing the Music Notation", as well as the tutorial video at https://www.notation.com/TutorialVideos.php