The search page will come up with a fairly blank box initially. If you create a personal login to manage your Newspapers.com Library Edition account, you will be able to see your previous searches and even save them for notification if new content is added to that newspaper.
Keywords can be names, places, events in history, etc. HINT: using quotes around a name or set of words will often help target your search: "John Davenport" or "Bay of Pigs".
Clicking on the Show Advanced (showing as Hide advanced here as it has already been toggled) options will allow you to add Place and/or Date to your initial search. These narrowers can also be used after you reveal your results.
The results of a search will allow you to see the number of results, your highlighted term, narrow by location using the map (hovering over a state will show how many results in that state, clicking on it will narrow to that state), choose particular papers, narrow to when added to collection, as well as use the date widget slider or box to narrow to a particular date or range.
In the search terms box, you can simply X out of terms you don't want or add to the box or enact the Show Advanced option. (NOTE: if you have logged in as a personal user, your search terms will show the next time you come to search. Or you can save your searches).
Here are some suggestions for exacting results in Newspapers.com Library Edition: