Specific operation can refer to the following steps:

First, open "Settings" on the phone desktop, as shown in the figure below.

2. After entering the "Settings" page, find "Lock Screen, Password and Fingerprint" and click to enter, as shown below.

3. Select "Screen Lock Advanced Option" on the "Screen Lock, Password and Fingerprint" page to enter, as shown in the following figure.

4. Click the "Lock Screen Signature" option in the upper left corner, as shown in the figure below.

5. Click the button "Lock screen page to display signature information" to open this function, as shown in the figure.

6. Enter the text you want to display, and then click OK in the upper right corner.

7. Return to the main interface of the mobile phone, and you can display the set "signature" (the signature will only be displayed if the theme is the default theme, but it will not be displayed if the personalized theme is set).