Yes, you can manage your JJB Sports Mastercard account online. The online account management feature offers customers the convenience of accessing their account information at any time. Through the online portal, users can review recent transactions, check their account balance, make payments, and update personal information. This feature is designed to provide a streamlined way for customers to keep track of their spending and ensure timely payments. Users can typically log in to their account using their credentials on the official JJB Sports website. For specific details about the capabilities and limitations of the online account management system, it may be helpful for users to refer to the current web page or user guides available on the site.