1. First click on the friend card in social interaction, and then click on the signature, as shown below.
2. Then paste the copied color signature code and click Yes at the bottom right, as shown in the figure below.
3. Then quit the game completely and re-enter the game, as shown in the figure below.
4. Finally, in the personal homepage interface, as shown in the figure below, you can see that the signature is directly changed to color.