1. If you created your login using "Log on with Twitter" or "Log on with Facebook" you don't actually have a password. Authentication into iToysoldiers is handled by Twitter or Facebook - whichever one you used. So if you're going through and changing your password on all your accounts you don't have to worry about iToysoldiers because we're authenticating using those services.
2. If you created your account with an email and user ID then you can change your password (after logging in) at http://itoysoldiers.com/user/edit.