1 First, you need to find the function of "Settings" on the desktop of your mobile phone, and then click Enter, and then you can design it.

2. Then, after entering, you need to find the function that contains options such as password setting for screen locking, such as "security privacy".

3. Then, after you click enter, a function item of "screen lock and password" will appear in the interface. At this time, you need to click on it to enter the next link.

4. Finally, after entering the next link, you can see a function that says "Lock Screen Signature". Click and you can set the desired signature.