To change you forum password, access the User CP in the top left corner. There, you will find the option to change password in the Your Profile section on the left hand side.
If you are referring to your password for the game, I am not aware of this being possible. Perhaps if you send a message to the support team they may be able to assist. Otherwise, I don't think it can be changed.
If you are referring to your password for the game, I am not aware of this being possible. Perhaps if you send a message to the support team they may be able to assist. Otherwise, I don't think it can be changed.