With CPanel, you have the ability to password protect a folder within your website. You can create as many logins as needed for a protected folder.
Click on Password Protect Directories in Site Management. To password protect a directory click on the directory's name. To protect a sub-directory click on the folder next to the name and then click on the sub-directory's name.
This takes you to a configuration panel where you must:
Check the box labeled 'Password protect this directory'
Enter the name of the protected directory (this is just what is displayed to the user when they try to access this directory).
You can then add as many users as you wish, entering a username and password for each