To use this procedure Save your file first then,
cut to the clipboard the eighth notes you want to jazzify and paste it in the textarea. Click Read.
Cut from this webpage and paste back into your NWC song.
Use Alt/tab to switch between your browser and NWC so you won't lose your cursor location in NWC.
Copy the above to your clipboard (it's pre-selected) and paste it into a song you have already open in NoteWorthy Composer.