Literally all I do as a librarian:
It’s asking for your password.
No, your password.
Not your library card.
Just type your password.
Not in the browser address bar.
No, I don’t know your password.
You’re right it’s probably our computer’s fault.
I understand why this patron is so upset. His plan — to come to the library on the last day of tax season and expect to find someone there who would promptly file his taxes for him — seemed, admittedly, foolproof.