To set a personalized signature, first open the phone to find the settings icon of the phone, and click to enter the phone settings. Now come to the phone settings page, you can see that there is no menu I am looking for. Slide down to find the lock screen and password menu. Now I have found the "screen lock and password" menu, and I can set it by clicking into the menu. In the penultimate line of the lock screen and password, you can see a menu of "Lock Screen Signature". There is also a hint that the setting information will be displayed in the lock screen interface. Just click on "Lock Screen Signature" here. Click "Lock Screen Signature" directly, and a signature dialog box will pop up. Enter the signature text here, which can be a sentence or several words. Just click on the input dialog box and enter the text. Wait for the text input to be completed, and click "Save" after confirmation.