You might have phpmyadmin installed in your server. (Try something like http://YOUR-URL/phpmyadmin
). You'll need to login using whatever username and password was used setup for your database (It can also be found in the config.inc.php file).
When you get in select "Databases" from the tab on the top; you'll see a list of databases on your server. Select the database that your Archon installation uses. You'll then see a list of tables in the database, select "tblCollections_Books" and you'll see a list of fields in this table.
Below the list of fields you'll see a row that starts "Add  field(s) ...". Select the "Go" button at the end of the row to add a field. Enter the following information in the next screen:
Default: NULL (choose from the select list, leave the text input blank)
Leave the other fields in the form alone. Press the "Save" button and everything should work.