I cannot guarantee that this will work, but I think it will. Locate the sql-query which gets all members (lines 142-145), and replace it with the following:
'## Forum_SQL - Get all members
strSql = "SELECT MEMBER_ID, M_NAME FROM " & strMemberTablePrefix & "MEMBERS WHERE M_NAME <> 'n/a'"
if mLev < 4 then
strSql = strSql & " AND MEMBER_ID = " & MemberID
end if
strSql = strSql & " ORDER BY M_NAME ASC;"
'response.write(strSql)
'response.end