When you finish typing a line or command you must press the key. Logging on In order to log on you must provide the computer your username and password . As a security measure your password will not appear on the screen. If everything goes OK the computer will start an X session. In addition to reminding you which computer you are using, prompts like this help you keep track of what you are doing.
Many programs have their own prompts.
Choose something no one else can easily guess but which is easy for you to remember. It should be at least 7 or 8 characters. Also dates, street addresses and license plate numbers are a bad idea. Punctuation marks, digits, and even most control characters are allowed in passwords. Capital letters are distinguished from lower case letters.