I know the specific database I want, how do I find it?

From Guides

From the Gelman homepage, click on ALADIN Research Portal, then on Databases by Title. You may type the database’s name or click the letter that corresponds to the name of the database you want in the A-Z list. Note: Some lists of database jump to a second page. Click the Next> link at the top of the page to continue browsing the list.