It seems that you are a junior or a junior. You must log in to the library system first, and you must log in with your own account. In the past, libraries all had special cards, but later they all changed to one. The account number is usually your student number, and you can change your password yourself. After you log in with your own account, you must have your own personal "loan situation" to check the amount of this option. Study hard, huh ...