Tool: Huawei mate9
1. Find the "Settings" option on your mobile phone and click to enter the setting function interface.
2. Find the "screen lock and password" option in the setting interface, and click Enter.
3. Find "Lock Screen Signature" at the bottom of the lock screen and password setting interface, and click Enter.
4. Then enter the interface for editing the lock screen signature. After editing, click Save below to complete the operation of setting the lock screen signature.