If you want to change the e-mail address you are registered with:
1. Log in to https://secure.kingart-games.com
2. Click on "Account"
3. Click on "Change email"
-Enter new email and click submit
=> You get an email to your old email address
4. Click the link in the email or copy it and paste it into your browser. The links starts with "https://secure.kingart-games.com/account/changeemaillink
=> The email is changed now and you can use it to log in to the website and the game.