As long as your palace is below level 5 u can change the kingdom. If your town is over level 5 you have to start a new account to join us in Kingdom 171.
If you are ingame on the worldmap (where you see towns, tiles etc.) you will see a map icon in the upper left corner of the screen. Click on it and the kingdom map will open. Again in the upper left corner you will find an icon where u can write in the Number of a Kingdom. Write in 171 and proceed.
Now you find me in Clan Wolverines, Nick: Moxx the foxx.