The search page allows you to specify if you wish to search Welsh or English language content, specific newspapers, date ranges or article types.
If you like to browse, you can do so by title or by titles in a geographic region. I've found it interesting and informative to browse titles within a geographic region to get an idea of coverage, focus and publication dates. The helpful calendar of published issues makes searching for a specific event or occasion that much easier. For an example of the calendar and publication information for the Cambrian, click here.