1. Turn on the phone and unlock the screen. Note that there is no text above the phone lock screen, as shown in the figure.

2. After entering the phone function page, find the function icon of "Settings" and click Open, as shown in the figure.

3. There are two switching columns above. We need to select the function in the column of "Common Settings" and click to enter the common settings, as shown in the figure.

4. After entering the common settings, we scroll down the screen and find the menu item "Unlock Style", as shown in the figure.

5. Click to enter "Unlock Style", find a menu of "Lock Screen Signature", and click, as shown in the figure.

6. A dialog box for entering text appears on the screen. You can use it in the dialog box.