To change the password for your Katana account, follow these steps:
If you're currently logged in, log out by clicking on your account name at the top corner of Katana and select Log out. Click Log out when the popup dialog appears.
On the login page of Katana, click 'Don't remember your password?' below the login form.
Enter your email address and click 'Send email' to have a reset email sent to you.
Click 'Confirm' in the email.
A new page will open in your browser where you can enter the new password.
Done!