Welcome to the live demo of WordPress. The goal of test drive is to allow users to test out the latest versions of WordPress without having to actually install it themselves. This site was created for WordPress beginners, but you are more than welcome to use it as well.
Please do not abuse this feature. It is created for the greater good of the community.
To login to this site visit: http://drive.wpbeginner.com/wp-login.php
P.S. Some users have a tendency of being stupid and changing the password. So if you notice that the password is not working, then simply send a tweet to @wpbeginner