Use the Search box from any page within Archeion to enter a word or phrase. A summary listing of archival descriptions which match your search will be returned. Click on the title of these to read a description in full. This will include a link to contact details for the archival institution which holds the records.
You can also do an Advanced Search by following the link beneath the main search box. This allows you to combine different search terms, to search for phrases, or to limit your search to a particular institution.
The Browse menu on the left of the screen offers a variety of ways of looking through the contents of this site, including by lists of the places, subjects and people covered by descriptions in Archeion.