I have a sugestion:

add this to the code

;------------->>  Variable Version

on *:join:#: {
  if ( $nick == %WarnLevel. [ $+ [ $nick ] ] ) {
    if ( %WarnLevel. [ $+ [ $nick ] ] >= 5 ) .notice $nick $nick you have %WarnLevel. [ $+ [ $nick ] ] warns now | .notice $nick your warn level must be less than 10.
    else .notice $nick $nick you have %WarnLevel. [ $+ [ $nick ] ] Warn(s).
  }
  else (%WarnLevel. [ $+ [ $nick ] ] == $null) .notice $nick you have 0 Warn(s).
}

;------------->> INI File Version

on *:join:#: {
  if ( $nick == $readini(Warns.ini,n,Warns,$nick) ) {
    if ( $readini(Warns.ini,n,Warns,$nick) >= 5 ) .notice $nick $nick you have $readini(Warns.ini,n,Warns,$nick) warns now | .notice $nick your warn level must be less than 10.
    else .notice $nick $nick you have $readini(Warns.ini,n,Warns,$nick) Warn(s).
  }
  else ( $readini(Warns.ini,n,Warns,$nick) == $null) .notice $nick you have 0 Warn(s).
}

THis way the people know hawe many warning points they have, ore not.