What do I have to put at lines 19/20 of this script? [closed]

local speed = script.Speed
local textbox = game.StarterGui.ScreenGui.SpeedAmountTextBox
local leaderstats = script.Parent.Leaderboard
local player = game.Players.LocalPlayer
local datastore = game:GetService("DataStoreService")
    local ds1 = datastore:GetDataStore("CashSaveSystem")

if player ~= nil then
    player:WaitForChild("leaderstats")
    player.leaderstats:WaitForChild("Speed")
end  
    MinSpeed = 15 --Player must be going this fast in SPS to earn money.

    while wait(0.65) do
        textbox.Text = speed.Value
        if player.Character.HumanoidRootPart.Velocity.Magnitude > MinSpeed and game.Players.LocalPlayer.Character.Humanoid.Sit == true then
           game:FindFirstChild("Humanoid")
            if game:FindFirstChild("Humanoid") == true and script.Speed.Value >= 0 then


        end
    end
end