Speed gui (my script)

--Create ScreenGui
local screenGui = Instance.new("ScreenGui")
screenGui.Name = "SpeedChangerGui"
screenGui.Parent = game.Players.LocalPlayer:WaitForChild("PlayerGui")

-- Make the ScreenGui moveable
local mainFrame = Instance.new("Frame")
mainFrame.Size = UDim2.new(0, 300, 0, 200)
mainFrame.Position = UDim2.new(0.5, -, , -)
mainFrame.BackgroundColor3 = .(, , )
mainFrame.Active = 
mainFrame.Draggable = 
mainFrame.Parent = screenGui


 inputBox = .()
inputBox.Size = .(, , , )
inputBox.Position = .(, -, , -)
inputBox.PlaceholderText = 
inputBox.Parent = mainFrame


 changeSpeedButton = .()
changeSpeedButton.Size = .(, , , )
changeSpeedButton.Position = .(, -, , -)
changeSpeedButton.Text = 
changeSpeedButton.Parent = mainFrame


 closeButton = .()
closeButton.Size = .(, , , )
closeButton.Position = .(, -, , )
closeButton.Text = 
closeButton.Parent = mainFrame


 openButton = .()
openButton.Size = .(, , , )
openButton.Position = .(, -, , )
openButton.Text = 
openButton.Parent = screenGui
openButton.Visible = 


  ()
     speed = (inputBox.Text)
     speed 
        .Players.LocalPlayer.Character.Humanoid.WalkSpeed = speed
    
        ()
    



changeSpeedButton.MouseButton1Click:(changeSpeed)

closeButton.MouseButton1Click:(()
    mainFrame.Visible = 
    openButton.Visible = 
)

openButton.MouseButton1Click:(()
    mainFrame.Visible = 
    openButton.Visible = 
)