Option 1: At checkout select the size option "Send Me a Finger Sizing Tool". A few days later the finger sizing tool will arrive in the mail. Place the desired ring finger in the rings to figure out your size needed. You will receive an email titled "Ring Size", simply reply to this email and you are done!
Option 2: At checkout select the size option "Email Size Later". Next go to a jewelry store at your local mall and asked to be sized. You will receive an email titled "Ring Size" simply reply to this email and you are done.