If you need to change your name, address, telephone number, or correct your birth information, these key parts of your account profile can only be altered in person at your library.  You will be asked to show ID with your request.

If you want to update your email address or change your username or PIN, login to the Catalogue and go to the Account Settings section (which is located at the top of the page).  You can change all 3 items from there.