The embassy does not change it. You will have to go in and do a new DS-160, submit it and print the confirmation page. I do not know if the new online appointment system makes you put the DS-160 confirmation number in when scheduling the interview (When we did it, we did not have to put it in). If it did, you will need to reach out to their support (I think it's called "Feedback" on the website) and tell them that you had to fill out a new DS-160 because of errors on the original one and give them the new confirmation (bar-code) number to associate it with your case. Or you can try to call them at the support number