Hello, when you say personalized signature, do you mean the display of owner information? You can enter it through the following settings: Desktop-Settings-Security and Privacy-Screen Security Protection-Owner Information.

A more detailed description of the problem will help netizens understand your troubles and help you solve the problem more accurately.

Thank you for your interest in MIUI. For more miui skills and preferential activities, you can pay attention to MIUI official Weibo /miui official WeChat MIUI rice pomelo.