At the top of the website there are boxes labeled Card # and PIN. Enter your 14-digit library card number and 4-digit PIN in to the appropriate box.
Once you click Log In you'll be taken to your account information. Click on the tab labeled Fines. (If you have unpaid fines, a red exclamation mark is on the tab.) This will display any fines or fees charged to your account.
The Reason column indicates why your account was charged and the Amount column indicates how much was charged. The total amount is listed in bold at the bottom.