Points exchange system not working?

I have this small casino group along with a casino I have recently made a Player Rewards program but I need the Players to be able to exchange their points for Credits below you will see my code. Warning I am not trying to get the local player! I am trying to make it where when you type into the textbox which is defined as User and then click on Button it does the function, it is a surfacegui! I use adornee so that it moves to workspace and makes the textbox works!

Button = script.Parent
User = script.Parent.Parent.Username.Text
player = game.Players.User

Button.MouseButton1Down:connect(function()
	game.Player.leaderstats.Points = game.Player.leaderstats.Points - 100
	wait(0.1)
	game.Player.leaderstats.Credits = game.Player.leaderstats.Credits + 100
	wait(0.1)
	game.Player.PlayerGui.Warning.TextLabel.Text = "Customer Service has exchanged your Points for 100 Credits"
	wait(5)
	game.Player.PlayerGui.Warning.TextLabel.Text = ""
end)

The part that is not working is it keeps saying User is not a vaild member of Players(It does not understand I am trying to use the var above named User! I do not know how to fix I have attempted to fix it 3 times already.

Button = script.Parent
Player = game.Players.Localplayer--LocalPlayer, instead of finding user name, you get the actual player. therefore, you don't need to find the username

Button.MouseButton1Down:connect(function()
    game.Player.leaderstats.Points = game.Player.leaderstats.Points - 100
    wait(0.1)
    game.Player.leaderstats.Credits = game.Player.leaderstats.Credits + 100
    wait(0.1)
    game.Player.PlayerGui.Warning.TextLabel.Text = "Customer Service has exchanged your Points for 100 Credits"
    wait(5)
    game.Player.PlayerGui.Warning.TextLabel.Text = ""
end)