Mistake in DS160, realized after 30 days, paid fees already, appt not yet taken

[elexhobby]

Hi,

I'm filling forms for my parents to get them a B2 (tourist) visa. I submitted the DS160 form, obtained a Stanley form, paid the fees in Citi bank. I was about to schedule an appointment when I realized that I entered the wrong birth date for my mother. What should I do? Thanks for any help! (I'm studying in the US currently, parents are in India).