1. Open the settings application of the mobile phone, usually in the home screen or the application list.

2. In the settings, find and click "Lock screen and password" or similar options.

3. On the screen lock and password settings page, find "screen lock style" or similar options.

4. In the lock screen style, select "Signature" or similar option.

5. After entering the signature setting page, you can enter the lock screen signature you want to display.

6, after the input, save the settings.