local player = game.Players.LocalPlayer
local gui = Instance.new("ScreenGui")
gui.Parent = player.PlayerGui
local button = Instance.new("TextButton")
button.Parent = gui
button.Position = UDim2.new(0, 0, 0, 0)
button.Size = UDim2.new(0, 100, 0, 50)
button.Text = "Walk Fast"
button.MouseButton1Click:Connect(function()
    player.Character.Humanoid.WalkSpeed = player.Character.Humanoid.WalkSpeed + 10
end)