So these are instructions from another country, but they are both on usatraveldocs, so I assume the process is the same/similar.
Step 1
Complete the non-immigrant Visa Electronic Application (DS-160) form; please see this link for the guidelines
Step 2
Log in to our appointment system and create a profile. Once logged in, choose “Schedule Appointment”. As you go through the process you will answer the interview waiver questions which will evaluate your eligibility to renew your visa through interview waiver.
Step 3
After you answer the questions, you will be prompted to pay and enter the visa application (MRV) fee. Please see this link for more information on how to pay your MRV fee. If you are eligible to apply for a visa through interview waiver, you will be able to print out the “Interview Waiver Confirmation Letter”