Most online hosting companies do have a web based method to create protected pages. These online scripts will do the manual commands that I linked to. If you're interested in learning how to setup password protected pages, then view my links.
Otherwise, do as Buck mentioned and try to use the hosting providers control panel.
You might also want to browse through
www.hotscripts.com for schedule management tools. They may already have something you're looking for written in something like PHP/Perl/etc...that is free.