At login time, you'll see a prompt resembling the following: 


Enter your user name and press the Enter key.
 Our hero, larry, would type: 


Next, enter your password. The characters you 
enter won't be echoed to the screen, so type carefully.
 If you mistype your password, you'll see the message 

and you'll have to try again. 
Once you have correctly entered the user name and
 password, you are officially logged in to the system,
 and are free to roam.