Are you talking sorting the e-mails you get or the contact list? I assuming you mean contact list.
Contact list: click on "contact list" on the left of the "page" -- this is the page you see when you click on "mail". when you're in the contact list, in the header just above the first contacts name you will see "name" with an arrow up or an arrow down. Click on that and it will do an adjustment. One way will make Adams the first name you see. The other way will make Zorro that first name you see.
If this doesn't work, let me know.