Sign-on to manage your Citi Cards account online. You can pay bills, organize multiple Citibank credit cards, view statements, check due dates, and more. Manage your Best Buy credit card account online, any time, using any device. Submit an application for a Best Buy credit card now. SIGN OFF ARE YOU SURE YOU WANT TO SIGN OFF? Sign Off Cancel. Enroll in Paperless Statements and Letters Review the current Citibank Vulgar Language Policy. By authorizing Online Bill Pay, I authorize Citibank, N.A. to initiate an electronic payment from my bank account and I authorize my bank to honor the withdrawal. This authority is for the My Best Buy® Credit Card account noted above and is to remain in effect until canceled in writing by Citibank, N.A., my financial institution, or me.