Jay,
You should be able to change your information by visiting the "My Adobe" page. You can access that by signing in here. Then, click on the "My Adobe ID" link. From here, you can change your email address and password. You can also update your profile infomration--such as your first and last name.
Note, if you want to change your username, this is not currently available on the "My Adobe" page. Send the Kuler team an email indicating your current username and what you would like ot change it to. Here's the email address (Kuler-feedback@adobe.com).
Good luck.
