There are only 2 methods to change one's name.
1. Click on the【Items】button in the game interface and purchase a Leader Rename item under the【Other】option
Item will automatically go to【My Items】 after purchase. Then click on the use button of the item and select OK, type in your new alias, click OK and you alias will be changed.
Note: Your alias and the name of your Mansion are the same.
2. Click on the avatar image on the interface (at the top left corner of the screen, click on the right side of the alias and enter the new alias then click ok)
Note: Both methods require player to spend 200 Gold unless it is the first time for you to change your name.