Where password file name is the name of the file that will hold the passwords for each username. You do not necessarily need to have unique usernames for each user. You could enter something like mystudent , for example, and everyone could use this one username and its password to view your pages. Using the Add option, input username and password combinations.
Full documentation is available in counter.html .
There are a number of options, including counting but not displaying the numbers. Each author should maintain a sequence of suffix numbers that are exclusively used in unique pages.