If you mean the WiFi password, you need to ask the owner of the router. If it is a library card, the password is generally 6 digits behind the ID card.

If you apply for a self-service accreditation machine, the default password in the future is six digits. When the reader applies for a reader's card at the registration office, if the password is not set, the default initial password of the card-making system is "66" (if applying for a self-service card-making machine, the default password will be six digits in the future). If you need to change the password, you can go to the registration office and the staff will handle it.