Create a new version of paste:

local primaryColour = colors.cyan
local secondaryColour = colors.blue

local monitors = {
 "monitor_0",
 "monitor_1"
}

for i,v in ipairs(monitors) do
 if not peripheral.isPresent(v) then
  table.remove(monitors, i)
 end
end

local taskFile = ".tasks"

if not fs.exists(taskFile) then
 A = fs.open(taskFile, "w")
 A.write(textutils.serialize({ "Made by HD -click me!" }))
 A.close()
end

local A = 0

function remoteTasks()
 for i,v in ipairs(rs.getSides()) do
  if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
   rednet.open(v)
  end
 end
 
 while true do
  os.queueEvent("")
  os.pullEvent()
  local id, cmd = rednet.receive()
  local cmd = textutils.unserialize(cmd)
  if type(cmd) == "table" then
   if cmd["command"] == "add" then
    local A = getTasks()
    table.insert(A, cmd["input"])
    saveTasks(A)
   elseif cmd["command"] == "del" then
    local A = getTasks()
    if A[tonumber(cmd["input"])] ~= nil then
     table.remove(A, tonumber(cmd["input"]))
     saveTasks(A)
    end
   end
  end
 end
end

local function clear()
 if #monitors >= 1 then
  for i,v in ipairs(monitors) do
   peripheral.call(v, "setCursorPos", 1, 1)
   peripheral.call(v, "setBackgroundColour", colors.black)
   peripheral.call(v, "setTextColour", colors.white)
   peripheral.call(v, "clear")
  end
 end

 term.setCursorPos(1,1)
 term.setBackgroundColour(colors.black)
 term.setTextColour(colors.white)
 term.clear()
end

function getTasks()
 if not fs.exists(taskFile) then
  return {}
 else
  local file = fs.open(taskFile, "r")
  local tmp = textutils.unserialize(file.readAll())
  file.close()
  return tmp
 end
end

local function redraw(screen, page)
 
 local text = "HD's Todo list."
 local tasks = getTasks()
 local maxX, maxY = screen.getSize()
 local maxY = maxY - 2
 
 --[[ Text ]]--
 --clear()
 
 screen.setCursorPos(1,1)
 screen.setBackgroundColour(colors.lightBlue)
 screen.setTextColour(colors.gray)
 screen.clearLine()
 screen.setCursorPos(maxX/2-#text/2, 1)
 screen.write(text)
 --------------
 
 for i=1, maxY do
  if i % 2 == 0 then
   screen.setBackgroundColour(primaryColour)
   screen.setTextColour(secondaryColour)
  elseif i % 2 == 1 then
   screen.setBackgroundColour(secondaryColour)
   screen.setTextColour(primaryColour)
  end
  
  screen.setCursorPos(1, 1+i)
  screen.clearLine()
  
  local num = i+(maxY*(page-1))
  
  if tasks[num] ~= nil then
   screen.write(num..": "..tasks[num])
  else
   screen.write(num..": ")
  end
 end

 screen.setBackgroundColour(colors.lightBlue)
 screen.setTextColour(colors.gray)
 screen.setCursorPos(2, maxY+2)
 screen.clearLine()
 screen.write("Back")
 screen.setCursorPos(maxX/2-#(tostring(page))/2, maxY+2)
 screen.write(tostring(page))
 screen.setCursorPos(maxX-#"Next", maxY+2)
 screen.write("Next")
 
 term.clear()
 term.setCursorPos(1,1)
 term.setCursorPos(2,2)
 write("HD's Todo list v1.0 (its improved :D)")
 term.setCursorPos(2, 6)
 term.setTextColour(colors.lime)
 write("Add Task")
 term.setTextColour(colors.red)
 term.setCursorPos(2, 8)
 write("Remove Task")
 term.setTextColour(colors.white)
end

local function showTask(pos, page, max, mon)
 local pos = pos - 1
 local screen = peripheral.wrap(mon)
 local num = pos+(max*(page-1))
 local tasks = getTasks()
 
 if tasks[num] ~= nil then
  clear()
  --error(num)
  --screen.write(tasks[num])
  --local sizeX, sizeY = term.getSize()
  --term.setCursorPos(sizeX/2-#"Pull any event to continue"/2, sizeY)
  --write("Pull any event to continue")
  
  if #monitors >= 1 then
   for i,v in ipairs(monitors) do
     peripheral.call(v, "write", tasks[num])
    local sizeX, sizeY = peripheral.call(v, "getSize")
    peripheral.call(v, "setCursorPos", (sizeX/2-#"Remove Task"/2)+1, sizeY)
    peripheral.call(v, "write", "Remove Task")
   end
  end
 end
 
 local ev, _, xPos, yPos = os.pullEvent("monitor_touch")
 local sizeX, sizeY = peripheral.call(_, "getSize")
 if xPos >= sizeX/2-#"Remove Task"/2 and xPos <= (sizeX/2+#"Remove Task"/2)-1 and yPos == sizeY then
  local A = getTasks()
  table.remove(A, num)
  saveTasks(A)
 else
 
 end
end

local function addTask()
 local tasks = getTasks()
 term.clear()
 term.setCursorPos(2,2)
 write("Task: ")
 tsk = read()
 table.insert(tasks, tsk)
 saveTasks(tasks)
end

local function delTask()
 local tasks = getTasks()
 term.clear()
 term.setCursorPos(2,2)
 write("Task number: ")
 nmbr = tonumber(read())
 if tasks[nmbr] ~= nil then
  table.remove(tasks, nmbr)
 end
 
 saveTasks(tasks)
end

function saveTasks(tbl)
 local A = fs.open(taskFile, "w")
 A.write(textutils.serialize(tbl))
 A.close()
end

local pageNmr = 1

function iCanRun()

while true do
 if monitors[1] ~= nil then
  clear()
  for _,v in ipairs(monitors) do
   local A = peripheral.wrap(v)
   redraw(A, pageNmr)
   os.queueEvent("")
   os.pullEvent()
  end
 end
 --redraw(term, pageNmr)
 
 local maxX, maxY = term.getSize()
 local ev, _, xPos, yPos = os.pullEvent()
 local mon = false
 
 if ev == "monitor_touch" then
  local mon = true
  maxX, maxY = (peripheral.wrap(_)).getSize()
 end
 
 if ev == "monitor_touch" then
  if xPos >= 2 and xPos <= 5 and yPos == maxY then
   if pageNmr > 1 then
    pageNmr = pageNmr - 1
   end
  elseif xPos >= maxX-4 and xPos <= maxX-1 and yPos == maxY then 
   pageNmr = pageNmr + 1
  elseif yPos > 1 and yPos < maxY then
   showTask(yPos, pageNmr, maxX, _)
  end
 elseif ev == "mouse_click" then
  if yPos == 6 then
   addTask()
  elseif yPos == 8 then
   delTask()
  end
 end
 sleep(.001)
end

end

parallel.waitForAny(iCanRun, remoteTasks)