When your library account was updated with a new barcode number, that new barcode became functional immediately.
Your Internet Browser may have been set up to remember passwords for sites you regularly visit. If you type your name and your computer automatically inserts a string of numbers (ex: 21234567890123) in the “Library Card #” box, this is most likely what’s happening. To fix this problem, just highlight the incorrect numbers and type in your new barcode number. Your browser will ask you if you want it to associate this new password with the page you are visiting. Just say “yes” to this question box, and you should have no problem viewing your record. The next time you try to log in to your account, your browser will automatically enter the new barcode number for you.