When you use the Find command from the Edit menu while editing an address or by using the Search option from the PopAddress popup menu, this is how it works.
If you enter text in the find dialog and click the OK button, the list on the left of the PopAddress edit window will display any records that contain the text (in any field) that you specified. If there is more than 1 record that matches, clicking on any other item in the list will open that record and select the matching text. You can also use the Find Next command to go to the next record in the list and select the matching text.
If there is no text defined in the Find dialog, all records will be displayed.
