1. First, open the setup software that comes with the system on the desktop of Huawei mobile phone (take Huawei mate8 mobile phone as an example here), and click the option icon of security and privacy in the main setup interface.

2. Then, find the screen lock and password options in the security and privacy interface, and click Enter.

3. Then, click the last option in the screen lock and password interface: screen lock signature.

4. Finally, an editing window of screen lock signature will pop up in the screen and password interface, enter the desired signature text information in the input box, and then click the Save button at the lower right.