Open the phone, find the function icon of "Settings" and click Open.

2. Select a function in the "Common Settings" column, and click to enter the common settings.

3. Scroll down the screen and find the menu item "Unlock Style".

4. Click to enter "Unlock Style", find a menu of "Lock Screen Signature", and click it.

A text input dialog box appears on the screen, and you can input the text content you want to express in the dialog box.