How to add a reward function or if statement?

function winRound()
    setInputEnabled(false)

    for i = 1, 1 do 
        for j = 1, numColours do
            playColour(j, 0.4, j)
    print("Stage " .. roundNum .. " completed") 
    cent.SurfaceGui.TextLabel.Text = roundNum * 10 .. " %"
    pr.SurfaceGui.TextLabel.Text = "Overall Progress"

        end
    end
    wait(timeBetweenRounds)
    setInputEnabled(true)
    -- next round
    startRound()

end
function startRound()
    inputIndex = 0
    roundNum = roundNum + 1
    local pattern = genPattern(roundNum, tick())
    currentPattern = pattern
    playPattern(pattern)


end

with these two functions given, which one could i use to either add an if statement, that if roundNum X == X another script will be set to disabled = false OR alternatively make it call on a reward function when roundNum x was reached to set the script to disabled = false?