Before you log in, the account has been stolen, and then someone logs in your account and changes the signature to: This QQ has been stolen. It is recommended to change the password immediately and set password protection. It is best to bind the mobile phone to improve the security of the account.

To apply for password protection to prevent theft:

Open the main QQ program and click the penguin icon in the lower left corner.

Select Security Center-Apply for password protection.

Then, a web page will open, and you can select security tools on the menu bar.

Select a confidential phone from the drop-down menu.

You can click bind now to bind a secret mobile phone, and all QQ account related information will be known at the first time.