The idea with this server behavior is that you apply it to the results page or edit it from there. With the server behavior you will need to craft your search form first, then you can make reference to the form elements from within the interface.
So here are some quick steps:
1. Create the search form, this can either be on the results page or a different page. The action of this form must go to the results page regardless.
2. Add your recordset to the results page. This will be a very basic recordset that will select all of the records that you would like to search through.
3. Apply the DataAssist Search server behavior. For the values you will use the lightning bolt icon to select the search field from the form. If the form is not on the same page you will need to go to bindings > form data and select the form page to get the bindings available on the results page.
If you have any questions about any part of this let us know.