If you don't know where to put the code, you don't need to use it.

Paste it and type !rps help to get the commands.

on *:TEXT:!rps*:#: {
  if ($2 == help) {
    .notice $nick Rock, Paper, Scissors commands:
    .notice $nick -
    .notice $nick !rps help - Displays the RPS help file.
    .notice $nick -
    .notice $nick !rps score <nickname> - Displays a player's score.
    .notice $nick -
    .notice $nick !rps - Begins RPS game.
  }
  elseif ($2 == score) && ($3) && (% [ $+ rpsscore. $+ [ $3 ] ] == $null)  { msg $chan $3 has no score yet, $nick $+ . }
  elseif ($2 == score) && ($3) { msg $chan $3 $+ 's score: % [ $+ rpsscore. $+ [ $3 ] ] }
  elseif ($2 == score) && (!$3) { msg $chan $nick $+ 's score: % [ $+ rpsscore. $+ [ $nick ] ] }
  elseif (!$2) {
    msg $chan Rock, Paper, Scissors game has commenced!
    set %x $rand(1,3)
    set %y $rand(1,3)
    if (%x == 1) && (%y == 1) { msg $chan $nick got rock $+ . $me got rock. It's a tie! }
    if (%x == 1) && (%y == 2) { msg $chan $nick got rock $+ . $me got paper. $me wins! | inc %rpsscore $+ . $+ $me 1 }
    if (%x == 1) && (%y == 3) { msg $chan $nick got rock $+ . $me got scissors. $nick wins! | inc %rpsscore $+ . $+ $nick 1 }
    if (%x == 2) && (%y == 1) { msg $chan $nick got paper $+ . $me got rock. $nick wins! | inc %rpsscore $+ . $+ $nick 1 }
    if (%x == 2) && (%y == 2) { msg $chan $nick got paper $+ . $me got paper. It's a tie! }
    if (%x == 2) && (%y == 3) { msg $chan $nick got paper $+ . $me got scissors. $me wins! | inc %rpsscore $+ . $+ $me 1 }
    if (%x == 3) && (%y == 1) { msg $chan $nick got scissors $+ . $me got rock. $me wins! | inc %rpsscore $+ . $+ $me 1 }
    if (%x == 3) && (%y == 2) { msg $chan $nick got scissors $+ . $me got paper. $nick wins! | inc %rpsscore $+ . $+ $nick ) 1 }
    if (%x == 3) && (%y == 3) { msg $chan $nick got scissors $+ . $me got scissors. It's a tie! }
  }
}