Log in to computer version qq.
Click the "Main Menu" button at the lower left corner of the panel, select "Security", and select "Security Center Home".
You can see that there are two security methods under "My Security" on the pop-up page, "Security Phone" and "Mobile App".
If the account is not bound to a mobile phone, just bind the mobile phone number according to the prompt. Note that once bound, it cannot be unbound, but can only be replaced.
The second way is to use the mobile phone app to scan the QR code on the screen. Download the qq security center app.
Open the app, click the avatar in the upper left corner, click "Login", and then click "qq Login".
Click "Next", fill in the verification code, click "Next", and click "Start the security journey". If the security question has been set before, it can only be deleted and cannot be changed. If it is not set, it cannot be set now.