If you forget your password:

We cannot find out what it was. TheCAT will give you a new password. Go to any of theCAT front desks and show your photo ID. You will be given a sheet similar to the one you were given when you first got your account. If our automation is working fine, your new password will be active within one hour.

Changing your password 

You can find more detailed information in the appropriate operating system section: Windows or Unix