wrongly entered degree certificate date

Hi
i recently completed filling the ECFMG forms in the ECFMG site for my step 1 and i got the 186 and 187 forms as well, but when entering the details, i wrongly entered the "date when the degree certIficate issued" as 31-mar-12 instead of 02-aug-12, and i have paid the fees for step 1 as well, but i haven't got the signature from dean in my forms, is it possible to go back again and fill a new form and correct these details or there is no way, can someone please clarify this.

thanks