How to delete the SMS that has been backed up to qq Synchronization Assistant?

Hello, you can access your backed-up short messages and business cards by logging in to the QQ synchronization webpage and clicking Address Book Management, or you can log in to QQ and click the application box to open the address book and click Synchronization, and you can also see your backed-up business cards and short messages. Let's change it from here, I hope it will help you.