Feedback for an article is available at the Forums. There is a section there known as "Getting Help from the HubPages Community".
GoTo the forums found at Explore in the heading above
Look at the left for "Getting Help from HubPages Community"
Open a new post at 'Start a New Discussion' at the top right
In the 'Subject' ask something like, "Seeking Help improving my article"
In the message briefly, explain your needs. For instance, I did help to pass the Quality Assessment Process (QAP).
It is best to give a link to your Hub. I think a link is provided within the email from HubPages saying your article needs improvement if not published. It may be published and just not 'Featured'. In that case when you GoTo your article the link will be in your browser window.
I hope that helps . . .