I haven't looked at Noteworthy recently, but a common usage is to underline the "quick key" on the menu that drops down when you use the long Edit-click method. Common implementations require an Alt + underlined character, but in some progams the underlined char alone gets the function.
I presume there's no such marking in Noteworthy? (Ooops, I just looked. Lots of Underlines.)
Use of this hint is almost NEVER documented, but should always be kept in mind when exploring a new program - just in case it might be there.
Information is sometimes hidden in the help files under "shortcuts" or "quick keys," or occasionally just as "keyboard;" but often it's just "assumed knowledge."
Reading all of the help is a lost art, probably because of the frequent "nothing useful there."