You can search on the first or last name, but not both. Note that the search is an exact match. If you are unsure of the exact spelling of a name, search on a short string of letters that will be more likely to have a corresponding match.
Click on Filter to display the search results sorted by last name. Click on the first name to display the person's contact details. You can use the A-Z index to zero in on a last name. Note that it is not possible to sort any of the columns.