There are two search tools in the control box at the top of this page. The "Quick Search" lets you enter keywords to identify the hospital you're looking for. In fact, usually just a few letters of those keywords will work. For example, to look up The Cleveland Clinic in Cleveland, Ohio simply key in "clev clin" and you will see a dropdown list of several hospitals that match your search. Then just click on the one you want. (Keywords can pertain to a hospital's name, city, and/or state. Either word fragments or common abbreviations are generally acceptable.)
The other way to look up a hospital is by using the "Advanced Search" above. Click the Search button and you will be shown a form where you can enter criteria identifying the hospital(s) you're interested in. For example, if you enter "cleveland" as the city you will be see a list of hospitals in cities named Cleveland. Then just select the one you want.
(Sometimes you may need to refine your search criteria since searches will not return a list of more than 50 hospitals.)