The wizard cannot be re-entered to edit created pages. You can either make the changes on the pages in dreamweaver after or delete and re-create the pages.
You can delete all but one of the search fields and then edit the DataAssist Search server behavior to use the one remaining field to search all of the colums.
To display the related field value, you would edit the recordset and add an INNER JOIN to bring the value from the related table into the recordset so you can display it on the page.