How to adjust Personal Settings on old account

[Argus Panoptes]

Last weekend, I decided to register on the Paizo site in order to join the Pathfinder Society. When I did that, I found that I already seemed to have an account. Checking the old orders online and looking through my email, it seems that I asked for an emailed receipt when I bought a DVD from the Paizo booth at GenCon 2008, and that's when I signed up for the weekly mailings. I started customizing the settings, until I ran into trouble changing the Personal Settings (I wanted to put lower-case letters in my first and last name):

IMPORTANT
A complete Date of Birth is required. Collecting this information helps Paizo protect the privacy of minors.

A laudable goal. But I can't find a way to enter my complete Date of Birth.

[Chris Lambertz]

Hi Argus, we'll go ahead and email you concerning this one since it concerns personal information. The email will be sent to the one on file for the account you've used to post here.

[Argus Panoptes]

Thank you, that worked, and I've made the adjustments I wanted.