Home Institute Divisions Library FAQ / How to.... Library_account FAQ: Library Account Where do I find my online account? Please access the library catalog or click here. Which are my login data? Your username is the number on the backside of your library card. The default password are the first three letters of your family name. Where do I find my user number? You can find it on the backside of your library card. What is my password? The default password are the first three letters of your family name. You can change your password on the “You Account” page after logging in. My account is locked. What can I do? Please contact the librarians.