From Online Manual
View All Members
Provided that you have the appropriate permissions, you will be able to see the Members entry on the Main Menu or in the Info Center (en). Clicking one of these links will bring you to the View all Members page, the default page for the Members List section. There is also a Search for Members page in this section, 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. Pages are used so that there are not too many members listed on one single page. When there is more than one page, the additional pages can be selected from here. On the right side of the "Members List" title bar, every letter of the English alphabet is displayed. These letters are used to jump to the usernames of registered members that begin with that letter, so that you do not have to scroll through several pages to find them. 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 selected letter.
All usernames in the memberlist can be ordered by: Status (Online/Offline), Username, Email, Website, ICQ, AIM, YIM, MSN, Position, Date Registered, and Posts. These column headings are links that can be used to sort the list in ascending or descending order, or to reverse the sort order of the column under the heading that is currently used to sort the list.
Search for Members
This section allows you to do either a simple search for members, or to choose to filter your results by using additional parameters. You can search for members based on their username, email address, messenger nickname, website, or position.
The search results will show matches for the terms that you enter in the search field. If any of the additional search parameters are selected, then the results will also be filtered accordingly. The search does not look only for full-word exact matches, but also for any parts of text that match the search terms. For this reason, if the search term represents only part of the word that you are looking for, then the results may show many more matches than expected.
Some of the additional search parameters relate to information that users can either choose not to include in their profile (messenger nickname, website) or they can choose not to reveal it to the public (email), so using these parameters might not always bring up the results that you are looking for. The results of the search will be more accurate the more letters/words that are used in the search.