The way to transfer between servers (called Kingdoms in the game) is available for new players only — it's called a Server Teleport, and it's available in the game Store and in the main menu (under double arrow).
You can also change the server/kingdom by following these steps:
- When you are on your city screen, click on the map symbol in the bottom left corner.
- Click on the minimap symbol in the top left area of the map.
- In the same location, there is now the kingdoms button, click it to open the Kingdom list.
- Select the kingdom you want to join.
There are certain limitations on server transfers:
- Your game account must not be older than 7 days.
- Your Warlord level must not be above level 15.
- Your Citadel level must not be above 7.
- Some servers can be full and unavailable for teleporting.
All the limits are set by development team to avoid overpopulation and keeping the balance between new and veteran players.