1 You don\'t need the /\'s.

2 isnt secure coz any1 can do it. and set to certian channels

on *:TEXT:*:#:{
  if ($1 == !add) {
    /writeini users.ini $2 level $3
  }
  elseif ($1 == !del) {
    /remini users.ini $2
  }
}

try

  if ($nick isop $chan) 
  if ($nick ishop $chan) 

Etc =)