2. on the "my" page, find the "security authentication" option and click enter.

3. in the "security authentication" page, find the "code scanning authentication" option and click enter.

4. in the code scanning authentication page, click the "start code scanning" button. Scan a given QR code with a mobile phone.

5. Then, the system will automatically identify the QR code, jump to the corresponding authentication page, and follow up according to the page prompts.