The program is SethBling's "Fell" program which makes the turtle cut down your trees.

I'm on a mac so I can't go on the pastebin he provided and copy and paste. Mac's copy paste is control+c/control+v. If you press control in a turtle it brings up the menu, so I can't paste. This means I'm typing everything out word for word.

local function checkFuel() if turtle.getFuelLevel() < 1 then turtle.select(1) turtle.refuel(1) end end local function column() while turtle.digUp() do turtle.dig() checkFuel() turtle.up() end turtle.dig() checkFuel() while turtle.down() do checkFuel() end end local function digmove() checkFuel() turtle.dig() turtle.forward() end digmove() column() turtle.turnRight() digmove() turtle.turnLeft() column() turtle.turnLeft() digmove() digmove() turtle.turnRight() column()

The 18th line is just "checkFuel()" so I don't see why I need a number?

I tried 1 and 0 so far, but I don't know what else to do..