You have 2 easy ways for changing your password. You can either do it on the signup page or in your account.
1) Use the "Forgot password" link on the Sign in page and follow the instructions in the email you'll receive shortly after.
2) Log in to your Creatopy account, click on your user profile icon in the upper right corner, and select Account settings.
Under General, you will find the Change password button which triggers an email to your inbox associated with your Creatopy account. Follow the instructions in the email to complete the password change. And you're done! :)