If you've lost your QuickBooks Online login information, there are several steps you can take to recover it. First, try resetting your password through the QuickBooks login page by clicking the "Forgot password" link and following the prompts. If you've forgotten your username or email associated with your account, try using the "I forgot my user ID" link to recover your information. If these steps don't work, you may need to contact QuickBooks Online customer support for further assistance.