QOwnNotes doesn't support ownNote.
ownNote uses HTML files in your ownCloud database, QOwnNotes uses plain text files (with markdown support) on your hard drive.
With ownNote you can't access your notes directly and HTML isn't very suitable for taking quick notes, since it was only meant as presentation layer for the web. Markdown does a lot better job here.
I'm sorry about the naming similarities of QOwnNotes with ownNote.
Please use the ownCloud notes application to access your notes in the web.