User blog comment:Linathan/Guide: How to claim your FREE unit (Brave Frontier 2nd Anniversary) & Lucia/@comment-107.222.205.159-20151031133844/@comment-26140304-20151031140553

You can't change your response once you entered. What you could do is send a ticket to the support team to see if there's any way to change your response. I can't guarantee anything, however.