This issue was also addressed in this thread: http://www.avvo.com/legal-answers/in-multnomah-county-for-parenting-time-change--wha-1280834.html
It may be possible to overturn a default if you can demonstrate good cause for the failure to reply in time. I'm afraid it is impossible to provide adequate step-by-step instructions in a limited forum like this; that's not what this site is for. No one can say any magic words here that will instantly solve your problems. You're going to have to be proactive, consult with an attorney (or a few, to get a better deal) in private, and take action.
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