local gui = Instance.new("ScreenGui")
gui.Parent = game.CoreGui

local frame = Instance.new("Frame")
frame.Parent = gui
frame.Size = UDim2.new(0,160,0,80)
frame.Position = UDim2.new(0.5,-80,0.5,-40)
frame.BackgroundColor3 = Color3.fromRGB(40,40,40)
frame.Active = true
frame.Draggable = true

local button = Instance.new("TextButton")
button.Parent = frame
button.Size = UDim2.new(1,-20,0,40)
button.Position = UDim2.new(0,10,0,20)
button.Text = "Say Hello"
button.BackgroundColor3 = Color3.fromRGB(60,60,60)
button.TextColor3 = Color3.fromRGB(255,255,255)

button.MouseButton1Click:Connect(function()
    game:GetService("TextChatService").ChatInputBarConfiguration.TargetTextChannel:SendAsync("Hello")
end)