Jmloy,
Navigate the Bible window to the book, chapter and verse on which you wish to make a note. Click in the editor window and make sure you're on the Study Notes tab. Type and save your note. Go to the next or previous chapter, then back to where you saved the note. On e-Sword v11.0.6, you'll now see a double underline under the verse number in the Bible window! I think it was indeed a wavy underline on earlier versions. I'm using Windoze 10, so perhaps that is why I see the double underline instead. Either way, whenever you see any verse number underlined in whatever manner, that's your clue that you have a note or notes on that verse. Click on that verse number and said note/s will appear in the note/editor window. You can edit or delete any portion of that or any other note at any time. Effectively, you're building and maintaining your own personal commentary on any verse. Cool, huh?