Searching a user you'll see this:
I think this sentence needs to be reworded, since I see no way selecting more users and no checkboxes. I can select one at the time.
Use this form to search for specific members. You do not need to fill out all fields. To match partial data use * as a wildcard. When entering dates use the format YYYY-MM-DD, e.g. 2004-02-29. Use the mark checkboxes to select one or more usernames (several usernames may be accepted depending on the form itself) and click the Select Marked button to return to the previous form.
Member is misleading, should be reworded to user as well.