You must be filing in a case in order to search the Public Service List.
When adding a service contact to a party on a case, select "Add from public list" from the Actions menu.
Search for the service contact by name, attorney number, email address, or firm name. To search by attorney number, enter the attorney number in the "Last Name" search field.
Partial entries are OK - e.g., you can type "indy.gov" in the email address field to search for anybody with an email address in the @indy.gov domain, or "atg.in.gov" to search for people in the Office of the Indiana Attorney General.