Have you completed the DS-160 online and received the confirmation sheet?
Completing the DS-160 on line and submitting the application is just one step in the visa application process. If you are aged 14 – 79 you are required to schedule an appointment to apply for the visa in person. The appointment can only be scheduled by calling the Operator Assisted Information Service.
Applicants under the age of 14 and those aged 80 and over, may be eligible to apply for a visa through the courier company. You will find further information concerning this on our website at http://london.usembassy.gov