You must use a form to do this. It can be in Continuous View if you want it
to show multiple rows.

It is very easy to create an unbound text box (or combo) in the Form Header,
and use its After Update event procedure to filter the form.

There's some simple code here:
   Using a Combo Box to Find Records
at:
   http://allenbrowne.com/ser-03.html

This one allows you to specify which field to search (choose from a combo),
and what value to search for (type in a text box), and applies the filter
with each character you type:
   Find as you type - Filter forms with each keystroke
at:
   http://allenbrowne.com/AppFindAsUType.html
It's very easy to use: copy, paste, and set one property.

This one is a more comprehensive example, showing you how to offer a filter
on several fields in combination:
   Search form - Handle many optional criteria
at:
   http://allenbrowne.com/ser-62.html
It involves writing more code (specific to the fields you want to offer.)
The screenshot illustrates how a continuous form can be set up to show
multiple rows.

You could try a parameter query.  This is the simplest (and least flexible)
method.

Field: PostCode
Criteria: [Find which postcode]

This will automatically display a dialog box everytime the query is
executed.  It will allow you to specify ONE postcode.