To change the password of your Plivo account from the console, browse to Change Password tab under account profile.
Here, you will be required to enter the old credentials for authentication and later you can create a new password.
In case you have forgotten the password to your Plivo account and are unable to log in, please click on forward password and this will trigger an email to the registered email address. Click on the link mentioned in the email and you should be able to change your password.
In case you face any issue, please contact our support team for assistance: https://support.plivo.com/support/home