The Search wizard is a wizard that walks through creating the search form for the results page.
if you already have a search form and a results page, you should not use the wizard, you should use the server hevior.
on the results page, go to the bindings panel. click the plus button, and select form data. select the search form page.
This adds bindings for the search form.
then add the data assist search server behavior. click the plus button to add a new criteria. From the columns list, you can use ctrl+click to selct multiple columns.
for the value, click the lightning bolt and select the form element to use.