Riamus2 used the wrong command to add users to the userlist, but I'd go with a different approach anyway.

on *:text:op me*:#: {
  if (!$eval($+(%,opask,$site),2)) { .describe $chan if u ask for that one more time i will kick you and than ban you from ever coming in here }
  else { 
    ban -k $chan $nick 2 I warned you! 
    unset %opask $+ $site
  inc %opask $+ $site 

New username: hixxy