Each user has full control to change their own login password, there are 2 options:
Option 1: When logged into your Client Hub account, click on your name in the lower left corner and select My Account then click on the Change link next to the password field. Enter your existing password then enter a new one and repeat to confirm.
Option 2: From the Client Hub login page click the Forgot Password link. An email will be sent to the users email address with a link to create a new password.