Do I have to use the administrator-given password always?

No, you don't have to use the adminstrator-given password beyond your first login into CollabNet TeamForge.

The site administrator may have provided you with a user name and password after creating your user account in CollabNet TeamForge. When you login using those credentials, you might be asked to change your password for security reasons. At this time, you can set a password of your choice.

Tip: You will not be asked to change your password if you had created your own account, or if a password-request had been raised for you or if an administrator had reset your password.