The first step is to open the Criminal Master. Click where the arrow points, as shown in the picture below:
The second step, then click the personal center, as shown in the picture below:
The third step, then click Settings, as shown below As shown:
The fourth step, then click on the nickname signature pointed by the red arrow, as shown in the figure below:
The fifth step, after finally modifying the name, click to modify the information. As shown below: