how do i add staff boots

[georgelordx]

so i found this sciript wich was staff boots script wich was made by gambit how do i add to me level.

//Custom staff boots system 
//By: Gambet 
//Controls: 
//  + and = key (left of backspace on American keyboard) - plus speed 
//  - and _ key (left of + and = key on American keyboard) - minus speed 
//  z key = toggle on/off 
//  Max Speed: 10 

//#CLIENTSIDE 
function onKeyPressed(code,key) 
{ 
 if (key == "z") 
  { 
   if (this.staff_boots == "on") 
    { 
      this.staff_boots = this.speed = ""; 
      player.chat = "Staff Boots -Off-"; 
      setTimer(0); 
    } else 
     { 
       this.staff_boots = "on"; 
       player.chat = "Staff Boots -On-"; 
       setTimer(0.05); 
     } 
  } 
 if (code == 187) 
  { 
   if (this.speed+1 <= 10) 
    { 
     this.speed+=1; 
     player.chat = "Speed: " @ this.speed; 
    } 
  } else if (code == 189) 
   { 
    if (this.speed-1 >= 1) 
     { 
      this.speed-=1; 
      player.chat = "Speed: " @ this.speed; 
     } 
   } 
} 

function onTimeOut() 
{ 
 if (this.staff_boots == "on") 
  { 
   for (a=0; a<4; a++) 
    { 
     if (keydown(a)) 
      { 
       switch(a) 
        { 
          case "0": 
           player.y-=this.speed; 
           break; 
          case "1": 
           player.x-=this.speed; 
           break; 
          case "2": 
           player.y+=this.speed; 
           break; 
          case "3": 
           player.x+=this.speed; 
           break; 
        } 
      } 
    } 
  } 
 setTimer(0.05); 
} 

how do i make it usable in my level pls help me