To search for a specific yearbook, a certain person, or other content (such as clubs or teams) within a yearbook, look for the Search option in the upper right of any Classmates.com page, and select All Yearbooks from the drop-down menu. You can narrow your search results using the options under Narrow by on the left side of the results page.
You'll also see a Search option on the left side of each yearbook page when you're viewing a yearbook. From here, you can search for people or content within the specific yearbook you're viewing.
Using a mobile device? Just below the yearbooks you can use the search box to look up people or activities. While viewing a yearbook you can click on the magnifying glass to search for a specific person or click on who's in this yearbook and it will bring up a list of people in alphabetic order.