If you or a member of your team has lost your password, you'll be able to reset it before logging in by clicking 'Reset Password' at the login screen.
If you need to change the password directly, you can do the following:
Changing your teammates password
Go to the Users/Clusters section on the dashboard, then click edit on the user who's password you'll like to replace.
Add the new password here, hit save, then ask your teammate to login using the modified password.
Changing your own password
1. Click on the arrow head under your name, and then click on “Your Profile”
2. Go to the “Security” section and then click on “Change your password”
3. Enter your new Password and the click “Save”.