No Database selected message in the browser window?

I'm wrapping up a project (my first creating a dynamic website) and working on an update form that is triggered by a form variable using a subscriber's email address.  When I test the form, I get the subject message in the browser.

I know there's an error, but I don't have a clue as to where to look.  Any help will be greatly appreciated.

The insert record page works as does the delete record function, but the update record page has me stumped.