From Online Manual
View All Members
Upon clicking Members on the Main menu or in the Info Center, you will enter the View All Members page if you have permission to do so. The View All Members page is the default page for the memberlist section. There is also a Search For Members page in the memberlist, as well, where you can search for members registered on the forum.
On the View All Members page, you will see the list of all the members registered on the forum. At the top, you will be able to navigate through the pages of members, which are used so that there won't be too many members on one single page. On the right side of the "Members List" title bar, you will see every letter of the English alphabet. Clicking on a letter will lead you to registered members whose username begins with that letter. Note that this does not filter out all of the usernames beginning with different letters, but rather serves as an anchor, so you will be directed to usernames that start with the letter clicked. This is so that you don't have to scroll through several pages to find usernames that begin with a certain letter.
All usernames in the memberlist can be ordered in several different ways.
They can be ordered by: Status (Online - Offline), Email, Website, ICQ, AIM, YIM, MSN, Position, Date Registered, and Posts. Just clicking on one of these links will sort the members for you. Initially, they will be sorted in descending order. Clicking the same link again will sort them in ascending order.
Search For Members
This section allows you to search for members of your forum using several different filters. You can search for members based on their username, email address, messenger nickname, website, or position.
If a user does not allow their email address to be visible searching based on the email address may not turn up any results.