Pappport application - want to modify date of birth

I have entered wrong Date Of Birth in my passport application today(6-8-15) and i want to modift my date of birth , my appointment is on 10-6-15 , how to change or what to do

I guess, its already late but there should be no problem, just visit PSK on the given date with proper proof of your date of birth, specially the document you have mentioned in application.