how to run a farming program from a computer?

hello, i'm really new to this whole computercraft thing, i cant write code myself, but i have found a super nice farming program that i have modified a littel (only the wait time).
my question is, i use the same program on about 10 different turtles, and i belive there is a way to activate all of them at the same time so i dont have to go to every turtle and run the program, it's called farm.
this is the program

http://pastebin.com/qQdAcBYY

if somone can tell me exatly what to type in the computer and the turtles do make it so i only have to type the word farm in the computer and they all start farming it wueld help alot! i have been serching for tutorials for a while but havent found any that show how i can run a program from pastebin on multiple turtles by just using a computer:(

and tell me exactly what to type, cause i'm really stupid at this stuff :P/>

Use this as the startup program on the turtles

while true do
  local id, msg = rednet.recieve()
  if id == 9 and msg == "start" then --#insert id of main computer where 9 is
    shell.run( "farm" )
  end
end

Use this as the program to start them on the main computer

rednet.broadcast( "start" )

it's not working, when i reboot the turtle it says
startup:2: attempt to call nil

and the computer is saying

no such program

steffen03, on 03 November 2014 - 10:30 PM said:

it's not working, when i reboot the turtle it says
startup:2: attempt to call nil

Did you type it in correctly?

steffen03, on 03 November 2014 - 10:30 PM said:

and the computer is saying

no such program

You have to run "lua" then type this in:

rednet.broadcast( "start" )

metron80, on 04 November 2014 - 03:46 AM said:

Did you type it in correctly?

To be clear on this, line two should read:

local id, msg = rednet.receive()

It'd pay to stick this in at the top of the startup script, too:

rednet.open("right")

… at least I think the modem'll be on the right…

thanks alot guys, you all helped alot, it works now :)/>

Bomb Bloke, on 04 November 2014 - 03:51 AM said:

It'd pay to stick this in at the top of the startup script, too:

rednet.open("right")

… at least I think the modem'll be on the right…

Just put whatever side your wireless modem will be on in the quotes of rednet.open.