After an administrator has created an account for you you will receive a confirmation email like this:
Click the blue button to confirm your email address is valid and then enter the supplied temporary password when prompted.
As soon as you login the system will prompt you to set a new secure password of your own.
Finally, as a security best-practise, you will have to login with your new credentials.
All new users also receive a welcome email once they have verified their email address which looks like this