1. First, find the Tik Tok icon on the mobile phone desktop, click to open Tik Tok software, enter Tik Tok's video interface, find my options at the bottom, and click Open.

2. Secondly, after entering the personal interface, find the three buttons in the upper right corner of the interface and click Open to enter the setting interface of Tik Tok. Click the first option in the interface to edit your personal data.

3. After entering the profile interface, you can see that there is a signature option in the interface. Click to enter the modify signature interface, and enter the personalized signature in the personalized signature column.