On the Homepage, to the right of the Logo, you will see the Search Box. This is where you can type in whatever search term you prefer.
You have two options. Simply click in the circle next to "Catalog" or "Website".
If you click next to "Catalog", your search will yield results from the Catalog.
If you click next to "Website", your search will yield results from the entire Website.
Helpful Tip: If you are searching for a Database, type the name of the Database in the search box, click next to "Website" and press "Enter".