You would be typing the URL in the address bar (like one has to on a computer you don't own) and leaving off the www because it usually doesn't matter.
This is my entry point to the site:
http://enworld.org/forum/usercp.php. Of course with modern browsers I don't have to type that every day -- just "en" is usually enough for the rest to fill in. But I still type it a lot because I use about five different computers regularly and they get their caches cleared.
The correct URL is www.enworld.org.