Dont use

function Bitems()

monitor.setBackgroundColour((colours.lime))
monitor.clear()
monitor.setCursorPos(20,5)

monitor.write(" Player online =   ")
monitor.setCursorPos(20,8)
monitor.write(" Player online =  ")
monitor.setCursorPos(20,11)
monitor.write(" Player online =  ")
monitor.setCursorPos(20,14)
monitor.write(" Player online =  ")
sleep(1)
-- monitor.setCursorPos(20,17)
-- monitor.write(" Go back  in 9")
end

mouseWidth = 0
mouseHeight = 0

monitor = peripheral.wrap("monitor_1")

monitor.clear()

monitor.setCursorPos(1,1)

w,h=monitor.getSize()

print(w)
print(h)

monitor.setBackgroundColour((colours.blue))

Bitems()

monitor.setBackgroundColour((colours.lime))




function checkClickPosition()
  if mouseWidth > 15 and mouseWidth < 25 and mouseHeight == 5 then

    rules()

  elseif mouseWidth > 15 and mouseWidth < 25 and mouseHeight == 10 then

    staff()

    elseif mouseWidth > 15 and mouseWidth < 25 and mouseHeight == 15 then

    Bitems()

  end
end


repeat


  event,p1,p2,p3 = os.pullEvent()


   if event=="monitor_touch" then


     mouseWidth = p2 -- sets mouseWidth
     mouseHeight = p3 -- and mouseHeight
     checkClickPosition() -- this runs our function

   end

until event=="char" and p1==("x")