How?
Create a search form to let site visitors look up specific records
Filter the database results to display only records matching a specific value
Note If you are using a custom query and want to substitute the value from a parameter in that query, select the Use this search form field check box, and then, in the Value box, type the name of the parameter.
Notes
An example of a default value would be to specify "Seattle" as the value for the City field. The default record would display information related to Seattle, but the user could enter a different city to search on.