If you need to change your Táve password, you can do so by logging in to Táve then going to Settings › Add/Change Users. You'll then change your password under your user profile:
If you're unable to login to Táve because you don't remember your password, you can reset it from the login page by choosing Forgot password?. You'll receive an email that will allow you to reset the password.
Be sure to enter the email address that you use to login to Táve on the 'Forgot Password' screen. Táve will only be able to send the password reset email there.